Exercise Physiology 2

Question 1

a bundle of muscle fibers is called:

a. periosteum
b. endomysium
c. fasciculus
d. sarcolemma

Answer 1

fasciculus

Question 2

to which of the following structures do the crossbriges attach during muscle action?

a. actin
b. myosin
c. M bridge
d. sarcolemma

Answer 2

Actin

Question 3

which of the following substances regulates muscle actions

a. potassium
b. calcium
c. phosphorus
d. selenium

Answer 3

calcium

Question 4

which of the following substances acts at the neuromuscular junction to excite the muscle fibers of the motor unit?

a. acetylcholine
b. ATP
c. creatine phosphate
d. serotonin

Answer 4

acetylcholine

Question 5

when throwing a baseball, an athletes arm is rapidly stretched just prior to throwing the ball. which of the following structures detects & responds to that stretch by reflexively increasing muscle activity?

a. golgi tendon organ
b. muscle spindle
c. extrafusal muscle
d. pacinian corpuscle

Answer 5

golgi tendon organ