A&P X2 Flashcards
The vast majority of the organic component of the bone matrix is composed of
Collagen
Calcitonin is secreted by the
Thyroid gland
A hormone secreted in response to hypercalcemia would increase:
Excretion of calcium (Ca++) ions &
Osteoblast activity
As bone grows in in a child, only two areas of cartilage are left at each epiphysis. These two areas are.
Articular cartilage, & epiphysial plate
A common fracture to the distal fibula is called a
Pott’s fracture
All of the following are functions of the skeletal system, except
A.) maintenance of pH balance,
B.) thermoregulation,
C.) protective enclosure of the viscera
D.) production of blood cells
Thermoregulation
The cells directly responsible for bone mineral deposition are
Osteoblasts
A hormone that decreases the activity of osteoclasts is
Calcitonin
What is secreted by bone cells to resorb the inorganic component of bone?
Hydrochloric acid
In endochondral ossification, the secondary ossification center occurs in the
Epiphysis
Cholecalciferol (Vitamin D3) is converted to Calcidiol in the ____
Liver
A person who shows signs of hypoexcitability of the nervous and muscular System, including decreased muscle tone and diminished reflexes may be suffering from——
Hypercalcemia
Osteocytes “communicate” with one another through gap junctions in channels called
Canaliculi
Bone growth by the addition of circumferential lamellae is called
Appositional growth
The main function of synovial fluid is
Lubrication
The ligament that secures the radius of the ulna to the elbow joint is there
Annular ligament
By plantarflexing your ankle you will –
Stand on your toes
The deltoid ligament of the ankle is also known as the
Medial collateral ligament
All of the following muscles are part of the rotator cuff, except:
-Terres Major,
-infraspinatus
-supraspinatus
-subscapularis
-Terres, Minor
Terres Major
The interosseus ligament between the tibia and fibula would be considered a –
Syndesmosis
The movement of the scapular medially toward the vertebral column is called
Adduction
The rotator cuff muscles extend from the ______to the head of the humorous
Scapula
Which of the following is an example of amphiarthrosis?
-hinge joint
-metacarpophalangeal joint
-interosseous membrane btw radius & ulna
-temperomandibular joint
Interosseous membrane btw radius & ulna
In fatigue resistant muscle, fiber that is suited for endurance type activities
Red fiber & oxidative
The connective tissue found in between fascicles within a muscle is called
Perimysium
Canaliculi
(Fig. 3)
AD
Volkmann canal
(Fig. 3)
AB
Central Canal
(Fig. 3)
C
Circumferential lamellae
(Fig. 3)
D
Osteon
(Fig. 3)
B
Fig. 4
# 31
Actin
Fig. 4
# 32
Myosin
Fig. 4
#33
Titin
Fig. 4
#34
H zone
Fig. 4
#35
I band
Fig. 4
#36
A band
Fig. 4
#37
Z-disk
Fig. 4
#38
Sarcomere
The molecule involved in the direct, phosphorylation of ADP in skeletal muscle tissue is
Creatine phosphate
In other for Crossbridge formation to occur, _______ must move to reveal myosin binding sites.
Tropomyosin
You are about to lift a heavy TV set. The short period of time where your muscles are building tension but have not yet started to shorten would be considered_____
Isometric
At the neuromuscular junction, the voltage-gated Ca++ channels are located on the
Axon terminal
The synaptic vesicles of somatic motor neurons release _________into the sinaptic cleft
Acetylcholine 
ATP is required for all of the following except:
-movement of Ca++ into the SR
-Detachment of Crossbridge
-“Cocking” the myosin heads
-movement of Ca++ from SR into sarcoplasm
Movement of Ca++ from SR into sarcoplasm
——— is used to store oxygen in myofibers
Myoglobin
During a muscle contraction, which of the following parts of the Sacomere gets smaller
I band
The movement of sodium ions into the muscle cell moves the electrical charge inside the cell in the positive direction. This is called.
Depolarization
After running for about 15 seconds the source of ATP for the next 30 to 40 seconds would be from
Anaerobic respiration
A powerful muscle group like the hamstring (thight) would most likely have a high ratio of white to red fiber. true or false
True
Increasing the frequency of action potentials to a motor unit is called
Temporal summation
