Week 4 - QUIZZES Flashcards
A motor neuron and all the muscle fibers it stimulates form a…
motor unit
Excitability refers to the ability of a cell to…
respond to a stimulus by producing an electrical signal
Muscle contraction is triggered by impulses carried over…
motor neurons
Muscles generate heat, stabilize the body positions and..
produce body movements
Myofibrils are composed primarily of…
Actin and myosin
What properties of muscle tissue has its ability to generate tension to do work?
Contractility
The motor end plate is part of a…
Skeletal muscle cell at the synapse
Which type of muscle tissue is involuntary, slow in contracting, and able to regenerate considerably better than other types of muscle?
Smooth muscle
A muscle which functions as the prime mover is called a
Agonist
An adductor muscle…
Moves a part of the body toward the midline
Antagonistic muscle groups
Perform opposite functions
In order for skeletal muscles to cause movement they must…
cross at least one joint
One of the largest, heaviest muscles of the body which is the chief extensor of the femur is the
Gluteus maximus
The Achilles tendon attaches (inserts) on the
calcaneus
The hamstring muscles act to
flex the leg and extend the thigh
The masseter muscle is located in the
Head
The medial compartment of the thigh contains muscles that _______ the thigh.
Adduct
The preferred site of injection in the buttocks region is the
gluteus medius
The strength and stability of the shoulder joint is provided by the
muscles and tendons of the rotator cuff
Tendinitis of the tibialis anterior can result in a painful condition commonly known as
shinsplints
Which muscle flexes the vertebral column?
rectus abdominis
A bone which has an epiphysis at each end is a
Long bone
A callus is
a mass of repair tissue that bridges the ends of a broken bone
As epiphyseal cartilage cells stop dividing and are replaced by bone, the result is a bony structure called the
epiphyseal line
Compact bone…
is arranged in units called osteons
Hemopoiesis occurs in..
red marrow
If epiphyseal plates are visible in an X-ray the bone is…
still growing in length
In adults, lipids are stored in the
yellow marrow
Osteoclasts:
break down the bone matrix
Spongy bone is found in:
the epiphyses of long bones
When blood calcium levels rise above normal, osteoclast activity is inhibited by the hormone
calcitonin
When there is too little calcium in blood, which cells begin resorption of bone to release calcium to the blood?
osteoclasts
What is found in the epiphyseal plate?
chondrocytes
True or false: Vitamin D production is a function of the skeletal system
False
During the later stages of pregnancy, hormones increase the flexibility of this joint to allow for the delivery of the fetus.
symphysis pubis
The acetabulum….
is formed by the ischium, ilium and pubis
The glenoid cavity is…
a depression for articulation with the head of the humerus
The longest, heaviest, and strongest bone of the human skeleton is the
femur
The pectoral girdle consists of the
scapula and clavicle
The radius is located on the ___________ side of the forearm.
thumb
When you sit, the part of the hip that touches the seat of the chair is the
ischial tuberosity
An opening in a bone through which blood vessels and nerves pass is a..
foramen
Besides the auditory ossicles, the only moveable bone of the skull is the…
mandible
How many lumbar vertebrae are there in a normal vertebral column?
5 fused
If a person slipped on the ice and hit in the back of the head, what bone might most likely be fractured?
Occipital bone
Soft spots in the skull filled with fibrous connective tissue which will eventually be replaced by bone are called
fontanels
Spinal nerves enter and leave the spinal cord through passages between the vertebrae called…
intervertebral foramina
The foramen magnum is found in the…
occipital bone
What type of bone is the sternum?
Flat bone
Which bone of the skull articulates with (touches) the vertebral column?
Occipital bone
What bone is not part of the skull?
Hyoid bone
What is the opening between the vertebral arch and body of a vertebra that houses the spinal cord?
Vertebral foramen
Which of the regions of the vertebral column has the greatest number of vertebrae?
Thoracic
Which suture is found between the parietal bones?
Saggital
Which type of bones of the body are slightly curved to absorb the stress of the body, and consist mostly of compact bone?
Long bones
Which vertebrae are largest and strongest?
Lumbar
