Lectures 1-12 Flashcards
1
Q
Describe the knee’s movement and muscle activity during early swing.
A
The knee is in flexion to lift the foot, with hamstrings and gastrocnemius as agonists.
2
Q
What is required to maintain bone homeostasis?
A
Adequate dietary calcium and moderate exercise.
3
Q
What is the transverse plane?
A
The plane that divides the body into top and bottom sections.
4
Q
Which tissue includes blood and lymph?
A
Connective tissue.
5
Q
What is the general process of sampling?
A
Sampling involves selecting a subset of individuals from a population to represent the whole population.
6
Q
What happens during bone remodelling?
A
Osteoblasts add bone matrix to the surface, and osteoclasts remove bone from the medullary cavity.
7
Q
What percentage of tissue in the human body is muscle tissue?
A
50%
8
Q
What are the three types of muscle contractions?
A
Concentric (muscle shortens), eccentric (muscle lengthens), and isometric (muscle length stays the same).
9
Q
Where is cancellous bone found and what is its function?
A
Found in the epiphyses; it is light, spongy, and good for shock absorption.
10
Q
Describe the three types of joints.
A
Fibrous (least movement, provides stability), Cartilaginous (some movement, connected by fibrocartilage), and Synovial (most movement, made of various tissues).
11
Q
How does bone maintain homeostasis?
A
By balancing Osteoblast and Osteoclast activity to regulate bone formation and destruction.
12
Q
What makes up the inorganic component of bone?
A
Hydroxyapatite and other calcium minerals; it makes bone hard and resistant to compression.
13
Q
What percentage of a bone’s weight is cellular, and what are the types of cells involved?
A
2%; includes Osteogenic cells, Osteoblasts, Osteocytes, and Osteoclasts.
14
Q
What is the sarcoplasmic reticulum (SR) and its function?
A
A membrane network that stores and releases calcium (Ca2+) during muscle contraction.
15
Q
What percentage of tissue in the human body is nervous tissue?
A
2%
16
Q
What body parts are included in the lower limb?
A
Thigh, leg, and foot.
17
Q
What occurs at the hip during late stance (toe off)?
A
The hip is in extension with gluteus maximus and hamstrings as agonists.
18
Q
What happens when many action potentials are fired in rapid sequence?
A
A sustained release of calcium, sustained actin-myosin interaction, and sustained contraction (summation).
19
Q
What are the characteristics of slow muscle fibres?
A
They supply steady force and are slow to tire.
20
Q
What is diffusion?
A
Movement of molecules from high to low concentration.
21
Q
What is rotation in anatomical movement?
A
Movement around the long axis of a joint.
22
Q
What is the coronal plane?
A
The plane that divides the body into front and back sections.
23
Q
Define the basic pattern of the gait cycle.
A
The gait cycle includes the stance phase, swing phase, and transitions like heel strike and toe off.
24
Q
What is the difference between location (central tendency) and spread in statistics?
A
Location (central tendency) measures where the data centers (e.g., mean, median), while spread measures the variability or dispersion of the data (e.g., range, standard deviation).
25
What are the classes of bones?
Long bones, short bones, flat bones, and irregular bones.
26
Describe the functions of the skeletal system.
Support, movement, protection, storage of minerals, and red blood cell formation.
27
What is tetanus in muscle contraction?
The maximal signaling and contraction capability of the muscle.
28
Describe the knee's movement and muscle activity during late swing.
The knee moves from flexion into extension to prepare for heel strike, with quadriceps femoris as the agonist.
29
What does the term "posterior" mean in anatomical terminology?
Towards the back of the body.
30
What is the resting membrane potential?
The electrical gradient when the cell is at rest, with the inside of the cell more negatively charged than the outside.
31
Define tissue and structure.
Tissue: Cells grouped together in an organized manner (e.g., DFCT). Structure: Something formed of a tissue (e.g., ligament).
32
What event causes the cross-bridge to be released?
The binding of ATP to the myosin head.
33
Describe long bones.
Longer than they are wide, with wider epiphyses and a longer diaphysis; act as levers for movement and are mostly limb bones.
34
Define terms used to describe spatial and positional relationships of structures.
Anterior/posterior, superior/inferior, medial/lateral, proximal/distal, superficial/deep.
35
Why do we take samples in statistics?
Samples are taken to make inferences about the entire population without having to study everyone.
36
When could bias influence sampling?
Bias could influence sampling when the selection process is not random or when certain groups are overrepresented or underrepresented.
37
What event allows a cross-bridge to form?
The presence of calcium.
38
What is the origin, insertion, and movement of the biceps brachii?
Origin: Scapula. Insertion: Radial tuberosity. Movement: Flexion at the shoulder and elbow, supination at the radioulnar joints.
39
Describe the microscopic structure of bones.
Compact bone has osteons with central canals, lamellae, lacunae, and canaliculi; cancellous bone has trabeculae with marrow and osteocytes.
40
What are muscle fibres and how are they organized in skeletal muscles?
Individual muscle cells that gather into bundles called fascicles, which bundle into muscles.
41
What are myofibrils and what are they made of?
Bundles within muscle fibres made of repeating units called sarcomeres.
42
What is adduction?
Moving a limb towards the midline of the body.
43
What is the main difference between the radius and ulna vs. the tibia and fibula?
The radius and ulna can supinate and pronate, allowing for wrist mobility, while the tibia and fibula provide stability with no pronation or supination.
44
What is the role of the plantarflexors at the ankle during standing?
To stabilize the joint as the line of gravity pushes it into dorsiflexion, consuming energy.
45
Describe flat bones.
Thin plates of compact bone (with some cancellous); they function for muscle attachment and protection (e.g., scapula, skull, sternum).
46
How can you recognize a normal curve?
A normal curve is a symmetric, bell-shaped curve centered around the mean.
47
What does the term "distal" mean in anatomical terminology?
Farther from the point of attachment or origin.
48
What are the two main divisions of the human skeleton?
Axial skeleton and appendicular skeleton.
49
What is a chemical gradient?
Uneven distribution of molecules across a membrane.
50
What is the origin, insertion, and movement of the hamstrings?
Origin: Ischium and femur (biceps femoris). Insertion: Tibia (semimembranosus and semitendinosus) and fibula (biceps femoris). Movement: Hip extension and knee flexion/rotation.
51
Where are the secondary ossification centers located, and what is their function?
In the epiphyses; they enable bone growth in length through the epiphyseal/growth plate.
52
What is abduction?
Moving a limb towards the midline of the body.
53
What occurs at the hip during late swing?
The hip remains in flexion, with iliopsoas and rectus femoris as agonists.
54
Where are Na+ and K+ ions located at rest?
Na+ is outside the cell, and K+ is inside the cell.
55
Where is the primary ossification center located, and what does it do?
In the diaphysis (shaft); it develops bone at different times.
56
Describe the structure of limb bones.
Each limb has a single proximal long bone (humerus/femur), two distal long bones (ulna and radius/tibia and fibula), and bones of the hands and feet.
57
What are the two extracellular components of bone?
Organic (33%) and inorganic (67%).
58
What is bony congruence?
The sum of bone surfaces that form an articulation, requiring more soft tissue where there is less congruence.
59
What does the axial skeleton consist of and what is its function?
Consists of the skull, vertebral column, and rib cage; it protects vital organs.
60
What are the connections between the limbs and the axial skeleton?
The pectoral (shoulder) girdle and the pelvic girdle.
61
What anatomical feature helps maintain a stable, upright stance without energy expenditure at the hip?
The line of gravity being posterior to the hip joint, pushing it into extension and tightening the ligaments.
62
How does the spread of the sampling distribution change with sample size?
The spread of the sampling distribution decreases as the sample size increases.
63
Describe the muscle activity at the hip during mid stance.
The hip continues moving into extension, with gluteus maximus and hamstrings as the agonists.
64
What is the difference between passive ion channels and active pumps?
Passive channels allow ions to move down their gradient, active pumps use energy to move ions against their gradient.
65
What does hypertonic mean?
Higher solute concentration outside the cell, causing water to leave the cell.
66
What is the origin, insertion, and movement of the deltoid muscle?
Origin: Scapula and clavicle. Insertion: Deltoid tuberosity. Movement: Shoulder flexion (anterior fibers), abduction (lateral fibers), and extension (posterior fibers).
67
What is the role of Osteoblasts?
They produce new bone matrix.
68
What is the origin, insertion, and movement of the gluteus maximus?
Origin: Ilium and sacrum. Insertion: Femur. Movement: Hip extension.
69
What is the origin, insertion, and movement of the iliopsoas?
Origin: Iliac fossa and lumbar vertebrae. Insertion: Femur. Movement: Hip flexion.
70
Where is cardiac muscle located and is it under voluntary control?
Located only in the heart and is not under voluntary control.
71
What is circumduction?
A combination of flexion, extension, abduction, and adduction.
72
Describe fibrous joints.
Made of DFCT, limit movement, provide stability (e.g., skull sutures).
73
What describes the sampling distribution for comparing two groups?
The sampling distribution for comparing two groups is centered on the difference between their population means and its spread is determined by the standard errors of the two samples.
74
What are the functions of connective tissue?
Fills internal spaces, provides structural support, stores energy, establishes a structural framework for the body, transports fluids and dissolved materials, protects delicate organs, supports, surrounds, and interconnects other types of tissues, stores energy (especially in the form of triglycerides), and defends the body from invading microorganisms.
75
What body parts are included in the upper limb?
Arm, forearm, and hand.
76
Describe cartilaginous joints.
Made of fibrocartilage, allow some movement (e.g., intervertebral discs, pubic symphysis).
77
Describe the knee's position and muscle activity during late stance.
The knee is in extension with hamstrings and gastrocnemius preparing for the next movement.
78
What does the term "superficial" mean in anatomical terminology?
Closer to the surface of the skin.
79
Where is compact bone found and what is its function?
Found in the diaphysis; it is strong and good at transmitting force in one direction.
80
What occurs during depolarization?
Positive ions enter the cell, signaling excitable cells.
81
How does the length-tension relationship affect muscle strength?
Each muscle has an optimal length where it is strongest, with changing overlap between actin and myosin filaments affecting strength.
82
Describe a bone pathology related to lack of homeostasis.
Osteoporosis, caused by more Osteoclast activity than Osteoblast activity, leading to thinning trabeculae and increased fracture risk.
83
Describe the ankle's position and muscle activity during mid swing.
The ankle is in dorsiflexion to allow toe clearance, with tibialis anterior as the agonist.
84
What are the key characteristics used to describe the distributions of population, sample, and sampling distribution?
Population is described by mean and standard deviation, sample by sample mean and sample standard deviation, and sampling distribution by the population mean (if unbiased) and standard error.
85
What is inversion?
Turning the sole of the foot towards the midline.
86
What is the role of triceps surae during mid stance?
It continues to move the ankle into plantarflexion.
87
What muscles are active at the hip during early swing?
Iliopsoas and rectus femoris as agonists, with gluteus maximus and hamstrings controlling the swing rate.
88
What happens to a cell in an isotonic solution?
No net flow of water, cell remains stable.
89
What is the ankle's position during early swing?
The ankle is in dorsiflexion to allow toe clearance, with tibialis anterior as the agonist.
90
What is the role of Osteoclasts?
They remove bone matrix.
91
When is a sampling distribution expected to follow a normal bell-shaped curve?
A sampling distribution follows a normal bell-shaped curve when the sample size is large enough, typically due to the Central Limit Theorem.
92
What happens at the hip during mid swing?
The hip remains in flexion, with iliopsoas and rectus femoris as agonists, and gluteus maximus and hamstrings controlling the swing rate.
93
What is pronation?
Turning the palms to face posteriorly
94
What does the term "superior" mean in anatomical terminology?
Above or towards the head
95
What is supination?
Turning the palms to face anteriorly.
96
What occurs at the hip during early stance?
The hip moves from flexion into extension with the help of gluteus maximus and hamstrings.
97
What are the key soft tissues involved in joint movement?
Cartilage (hyaline and fibrocartilage) and DFCT (ligaments, tendons, and joint capsules).
98
What is the function of synovial joints?
To allow a lot of movement, found in most appendicular skeleton joints.
99
What is the function of tendons?
To connect muscle to bone, facilitate and control movement, and transmit muscle contraction to bone.
100
What is the function of ligaments?
To connect bone to bone, resist tension, and restrict movement away from themselves.
101
Identify the major bones of the skeleton, and understand why/how some are sexually dimorphic.
Major bones include the skull, vertebral column, rib cage, and limb bones. Sexual dimorphism is seen in the pelvis to accommodate childbirth in females.
102
Describe the pectoral girdle.
Made up of the clavicle and scapula; provides stability and muscle attachments.
103
What is homeostasis?
It supports normal function of body systems by maintaining conditions in the internal environment through regulatory mechanisms.
104
What are the two key proteins that make up the myofilament?
Actin and myosin.
105
What happens at the knee during mid stance?
The knee moves from extension into slight flexion, with hamstrings and gastrocnemius as agonists.
106
What is an osteon, and what is its function?
A lengthwise unit in compact bone; provides a pathway for nutrients to cells in the ECM.
107
What are the functions of epithelial tissue?
Covers exposed surfaces, lines internal passageways and chambers, forms secretory glands, provides physical protection, controls permeability, provides sensation, and produces specialized secretions.
108
What is the function of bone cells?
They respond to external forces, change shape, remodel, and repair themselves.
109
What structures are included in epithelial tissue?
Epithelia and glands (exocrine and endocrine).
110
What are the three types of muscle tissue?
Skeletal muscle, cardiac muscle, and smooth muscle.
111
What causes Osteoporosis?
More Osteoclast activity than Osteoblast activity, leading to a loss of cortical bone and thinning of trabeculae.
112
What do muscle fibres, fascicles, and muscles contain?
Many blood vessels and nerves, sheathed in connective tissue.
113
How is the mean calculated?
The mean is calculated by dividing the sum of all values by the total number of observations.
114
Describe the different classes of bone in the human skeleton and explain how their shape relates to function.
Long bones (movement), short bones (weight-bearing), flat bones (muscle attachment and protection), irregular bones (varied functions).
115
Where does ion absorption occur?
Across the epithelial lining of the small intestine and colon.
116
What is the sagittal plane?
The plane that divides the body into left and right sections.
117
What is the ankle's position during late stance, and which muscle is the agonist?
The ankle is in full plantarflexion with triceps surae as the agonist for propulsion.
118
What is dorsiflexion?
Bringing the toes up towards the face.
119
What is an electrical gradient?
Uneven distribution of charges across a membrane.
120
How many bones are in the hands and feet?
Hands: 27 bones each (8 carpals, 5 metacarpals, 14 phalanges); Feet: 26 bones each (7 tarsals, 5 metatarsals, 14 phalanges).
121
What is recruitment in muscle force generation?
The process of activating more muscle fibres to produce more force.
122
What are the characteristics of fast muscle fibres?
They produce a lot of force quickly but fatigue quickly.
123
What percentage of tissue in the human body is connective tissue?
45%
124
Why is knowing terminology important in anatomy?
It allows effective communication and avoids vague descriptions or directions.
125
Describe the structure of compact bone.
Dense outer surfaces (periosteum), visible foramina for blood supply, made up of osteons with circumferential lamellae.
126
What does hypotonic mean?
Higher solute concentration inside the cell, causing water to enter the cell.
127
What is the function of fibrous joints?
To limit movement and provide stability, found in sutures of the skull and distal tibiofibular joint.
128
What is the standard error?
The standard error is the standard deviation of the sampling distribution.
129
What is the equation of a regression line?
The equation of a regression line is y = a + b × x, where a is the intercept, b is the slope, and x is the variable.
130
Describe short bones.
Nearly equal in width and length, mostly cancellous bone; they are weight-bearing (e.g., carpals and tarsals).
131
What creates the chemical and electrical gradients?
The distribution of Na+ and K+ ions across the cell membrane.
132
Describe irregular bones.
Various shapes and functions; they often have foramina (holes).
133
What is DFCT, and what are its characteristics?
Dense Fibrous Connective Tissue; contains fibroblasts, collagen, and some elastin, resists tension, and has little vascularity.
134
Describe the structure and function of the rib cage.
Made up of ribs and sternum; protects major organs like the heart and lungs.
135
What happens to a cell in a hypotonic solution?
Water enters the cell, causing it to expand and possibly burst.
136
Describe the structure and function of the vertebral column.
Made up of 24 vertebrae, sacrum, and coccyx; supports the head and trunk, and allows muscle and ligament attachments.
137
Which tissue can be divided into skeletal, cardiac, and smooth?
Muscle tissue.
138
What occurs during repolarization?
Positive ions are removed from the cell, returning to resting membrane potential.
139
What is the difference between a population and a sample?
A population includes all individuals of interest, while a sample is a subset of the population used for study.
140
What determines the function of a muscle?
The length, number, and arrangement of muscle fibers.
141
What is the origin, insertion, and movement of the triceps surae (gastrocnemius and soleus)?
Origin: Femur condyles (gastrocnemius) and tibia/fibula (soleus). Insertion: Calcaneus via Achilles tendon. Movement: Knee flexion (gastrocnemius) and ankle plantarflexion.
142
What is flexion?
Decreasing the angle between two body parts.
143
What are the functions of the skeletal system?
Support, movement, protection, storage of minerals, and red blood cell formation.
144
What is the function of fibrocartilage?
To resist tension and compression, act as a shock absorber, and deepen articular surfaces.
145
What is the function of hyaline cartilage?
To resist compression, mold bone surfaces at joints, and enable frictionless movement.
146
Describe the structure of cancellous bone.
Contains trabeculae (struts of lamella bone), marrow in cavities, and osteocytes in lacunae or on the surface.
147
Which tissue allows information to be quickly sent around the body?
Nervous tissue.
148
How does the ankle move during early stance?
The ankle moves from dorsiflexion to plantarflexion with triceps surae as the agonist and tibialis anterior controlling the foot drop rate.
149
What are movements in the coronal plane?
Abduction and adduction.
150
What are the two determinants of skeletal muscle force generation?
The number of muscle fibres recruited and the rate of muscle stimulation.
151
How do skeletal muscles cause movement at synovial joints?
By attaching to bones via tendons and shortening to create movement.
152
What are the components of an osteon?
Central canal (with blood vessels and nerves), lamellae (cylinders of ECM), lacunae (for osteocytes), and canaliculi (channels for osteocytes).
153
What are movements in the sagittal plane?
Flexion and extension.
154
What are the two types of bone tissue?
Compact bone and cancellous/trabecular bone.
155
What does the term "inferior" mean in anatomical terminology?
Below or towards the feet.
156
Define and demonstrate terms of movements as related to joints.
Flexion/extension (sagittal plane), abduction/adduction (coronal plane), circumduction, rotation, pronation, and supination.
157
Describe the general principles of bone growth.
Bone grows in length at epiphyseal plates and in width through appositional growth involving osteoblasts and osteoclasts.
158
Describe the structure and function of the skull.
Made up of the cranium and facial bones; protects the brain and supports sensory organs.
159
What is the role of Osteocytes?
They recycle protein and minerals from the matrix.
160
What responses are coordinated by the Heat-Gain centre when body temperature lowers?
Behavioral changes, vasoconstriction, reduced sweat production, shivering, and goosebumps.
161
How do male and female pelvises differ?
Female pelvises have a more circular pelvic cavity, a larger pubic angle, and a more open pelvic outlet to accommodate childbirth.
162
Who is more likely to develop Osteoporosis and why?
Biological females, especially postmenopausal, due to a loss of oestrogen and lifestyle factors (lack of exercise, poor nutrition, alcohol, smoking).
163
What are the functions of nervous tissue?
Conducts electrical impulses and carries information.
164
How is bone homeostasis maintained?
Balance between Osteoblast and Osteoclast activity, allowing constant bone formation and destruction.
165
What happens to a cell in a hypertonic solution?
Water leaves the cell, causing it to shrink
166
What happens if there is an imbalance of water and solute concentrations across the cell membrane?
Water will move to balance the concentrations, affecting cell size and integrity.
167
What is the origin, insertion, and movement of the tibialis anterior?
Origin: Tibia. Insertion: Tarsals. Movement: Ankle dorsiflexion.
168
What is eversion?
Turning the sole of the foot away from the midline.
169
What is the correct anatomical position?
Upright, facing forwards, feet together, palms facing forwards.
170
Where is smooth muscle found and is it under voluntary control?
Found in hollow organs (e.g., gut, blood vessels) and is not under voluntary control.
171
What does isotonic mean?
The solute concentration is balanced between the inside and outside of the cell.
172
Describe the gross structure of bones and explain how they reflect their functions.
Compact bone is strong for force transmission; cancellous bone is light and spongy for shock absorption.
173
What is the knee's position during mid swing, and which muscles are active?
The knee is in flexion with hamstrings and gastrocnemius as agonists.
174
Where are ion reserves primarily located?
In the bones of the skeleton.
175
What are some examples of set-points in homeostasis?
Temperature, ion concentrations (calcium, potassium, sodium), blood sugar levels, and fluid balance.
176
What information is needed to draw the shape of a normal distribution?
The mean and standard deviation are needed to draw the shape of a normal distribution.
177
What is the primary function of muscle tissue?
Contracts to produce movement.
178
Why are statistics important in health sciences?
Statistics help understand the health of the population, including the prevalence of diseases, risk factors, and the effectiveness of treatments.
179
What are some adaptations for bipedalism in humans?
Hands-free movement, less stability in hands, and fingers adapted for manipulation and precision.
180
At what point in the cross-bridge cycle does the myofilament slide?
When the myosin head uses its stored energy to pull on the actin filament.
181
How do atoms, molecules, cells, and tissues relate to each other?
Atoms combine to form molecules, which interact to form cells that can secrete and regulate. These cells and extracellular materials and fluids combine to form tissues.
182
What are the three classes of levers in the body?
First-class (stabilizes joint position), second-class (overcomes heavy loads), and third-class (large range of movement and speed).
183
What does the term "medial" mean in anatomical terminology?
Closer to the midline of the body.
184
What is the ankle's position during late swing?
The ankle is in dorsiflexion, with tibialis anterior as the agonist and triceps surae stabilizing the joint for heel strike.
185
What is the role of Osteogenic cells?
They are stem cells that produce osteoblasts.
186
What does the appendicular skeleton consist of and what is its function?
Consists of the limb bones; it is important for movement.
187
What does the term "anterior" mean in anatomical terminology?
Towards the front of the body.
188
Which tissues would you find in your knee joint?
Connective tissue (including cartilage and bone), muscle tissue, and nervous tissue.
189
What does the term "deep" mean in anatomical terminology?
Farther from the surface of the skin.
190
How do humans achieve energy-efficient standing?
By having specific anatomical features at joints that allow for minimal muscular support, mainly at the ankle joint.
191
What percentage of tissue in the human body is epithelial tissue?
3%
192
What is osmosis?
Movement of water across a membrane to equalize solute concentration.
193
Which tissue is the most common in the body?
Muscle tissue (50%).
194
What is feedback in homeostasis?
When a controlled variable moves too far from the set point and the body responds to bring it back to normal.
195
What is the primary site of ion loss?
The kidney.
196
What types of connective tissue are there?
Connective tissue proper (loose: areolar, adipose, reticular; dense: dense regular, dense irregular, elastic), fluid connective tissue (blood and lymph), and supporting connective tissues (cartilage: hyaline, elastic, fibrocartilage; bone).
197
What is the primary function of skeletal muscle?
To apply force to bones to control posture and body movements, mostly under voluntary control.
198
What does the term "proximal" mean in anatomical terminology?
Closer to the point of attachment or origin.
199
Which tissue forms glands?
Epithelial tissue.
200
What are transverse tubules (T-tubules) and their function?
Tube-like extensions of the sarcolemma that conduct electrical signals deep into the muscle fibre.
201
What is the origin, insertion, and movement of the triceps brachii?
Origin: Scapula and humerus. Insertion: Olecranon process of ulna. Movement: Extension at the shoulder and elbow.
202
Describe the pelvic girdle.
Made up of the two hip bones and the sacrum; supports weight-bearing.
203
What is the function of cartilaginous joints?
To allow some movement, found in intervertebral discs and pubic symphysis.
204
What are the roles of agonist, antagonist, stabilizer, and neutralizer muscles?
Agonist creates movement, antagonist opposes movement, stabilizer holds a joint still, neutralizer prevents unwanted movement.
205
What is plantarflexion?
Pointing the toes towards the ground.
206
What are sarcomeres and what do they contain?
Repeating units in myofibrils made of contractile proteins: actin (thin filaments) and myosin (thick filaments).
207
What is the role of tendons in skeletal muscles?
Connect muscles to bones.
208
Describe the microanatomy of tissues in joints.
Hyaline cartilage resists compression; fibrocartilage resists tension and compression; DFCT resists tension.
209
What is the sarcolemma?
The cell membrane of a muscle fibre.
210
What is the difference in structure between compact and cancellous bone?
Compact bone has an osteon structure; cancellous bone has a trabecular structure.
211
What is the origin, insertion, and movement of the quadriceps femoris?
Origin: Ilium (rectus femoris) and femur (vastus muscles). Insertion: Tibial tuberosity. Movement: Hip flexion (rectus femoris) and knee extension.
212
What is extension?
Increasing the angle between two body parts.
213
What is the function of trabeculae in cancellous bone?
Resist force from multiple directions and spread force distally.
214
How does the line of gravity affect the knee joint in bipedal standing?
It is anterior to the knee joint, pushing it into extension and locking it without energy expenditure.
215
How does bone grow in width?
Through appositional growth; osteoblasts add bone matrix to the surface, and osteoclasts remove bone matrix from the inside.
216
What is feedforward in homeostasis?
Anticipation of an event that will alter a controlled variable, leading to actions that minimize the effect.
217
What muscles stabilize the knee during early stance?
The quadriceps femoris, hamstrings, and gastrocnemius.
218
What makes up the organic component of bone?
Collagen and ground substance (proteoglycans); it resists tension.
219
Which tissue is the least common in the body?
Nervous tissue (2%).
220
What does the term "lateral" mean in anatomical terminology?
Farther from the midline of the body.
221
What responses are coordinated by the Heat-Loss centre when body temperature rises?
Behavioral changes, vasodilation, shunting of blood to the skin, sweat production, and respiratory heat loss.
