ch 11 quiz answers

Question 1

what happens when acetylcholine stimulates its receptors in the neuromuscular junction

Answer 1

the permeability of the sarcolemma to Na+ increases

Question 2

the process of engaging more motor units to increase the strength of a muscle contraction is called

Answer 2

recruitment

Question 3

if one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be

Answer 3

incomplete tetanus

Question 4

the sarcolemma of a resting muscule fiber is more permeable to

Answer 4

potassium

Question 5

shortening a muscle while it maintains constant tension is called

Answer 5

an isotonic contraction

Question 6

to stimulate muscle contraction acetylcholine is released from the ____ into the synaptic cleft

Answer 6

synaptic vesicles

Question 7

where is dystrophin the protein that is defective in muscular dystrophy normally found

Answer 7

between the outermost myofilaments and hte sarcolemma of a muscle fiber

Question 8

which is not a charcteristic of a muscle cell

Answer 8

plasticity

Question 9

during muscle contraction binding sites for myosin are uncovered by the movement of

Answer 9

tropomyosin

Question 10

which is true regarding the sarcoplasmic reticulum

Answer 10

releases Ca2+ when a muscle fiber is excited