Muscle System Part 2: Question Preview (ID: 1216)


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The impulse that triggers a contraction travels deep into a muscle fiber by mleans of
a) sarcoplasmic reticulum b) motor end plates c) mitochondria d) transverse tubules
myofibrils are composed primarily of
a) actin and myosin b) tropomyosin c) troponin d) ATP and ADP
The enzyme cholinesterase causes acetylcholine to
a) bind to actin b) form cross bridges c) decompose d) be secreted from the motor end plate
Creatine phosphate serves to
a) cause the decomposition of ATP b) supply energy for the change of ATP to ADP c) supply energy for the synthesis of ATP d) cause the decomposition of ADP
ADP molecules on the surface of actin serve as active sites for the formation of cross bridges with molecules of
a) ATP b) tropomyosin c) troponin d) myosin
The amount of oxygen needed to support the conversion of lactic acid to glucose is called the
a) refractory quantity b) aerobic conversion c) anaerobic concentration d) oxygen debt
a muscle cramp is likely due to a lack of
a) actin b) ADP c) ATP d) myosin
An example of a partial but sustained contraction would be
a) muscle tone b) all of the choices are correct c) twitch d) tetany
Compared to skeletal muscle, smooth muscle
a) contracts more slowly and relaxes more slowly b) contracts more rapidly and relaxes more rapidly c) contracts more rapidly and relaxes more slowly d) contracts more slowly and relaxes more rapidly
A motor unit includes
a) muscle fibers only b) several muscle fibers and one motor neuron c) several motor neurons and one muscle fiber d) motor neurons only
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