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Muscle System Part 2
Test Description: Review for ch 8
Instructions: Answer all questions to get your test result.
1) The impulse that triggers a contraction travels deep into a muscle fiber by mleans of
A
mitochondria
B
sarcoplasmic reticulum
C
transverse tubules
D
motor end plates
2) myofibrils are composed primarily of
A
troponin
B
ATP and ADP
C
actin and myosin
D
tropomyosin
3) The enzyme cholinesterase causes acetylcholine to
A
be secreted from the motor end plate
B
decompose
C
bind to actin
D
form cross bridges
4) Creatine phosphate serves to
A
supply energy for the synthesis of ATP
B
cause the decomposition of ADP
C
supply energy for the change of ATP to ADP
D
cause the decomposition of ATP
5) ADP molecules on the surface of actin serve as active sites for the formation of cross bridges with molecules of
A
tropomyosin
B
myosin
C
troponin
D
ATP
6) The amount of oxygen needed to support the conversion of lactic acid to glucose is called the
A
refractory quantity
B
oxygen debt
C
anaerobic concentration
D
aerobic conversion
7) a muscle cramp is likely due to a lack of
A
actin
B
myosin
C
ADP
D
ATP
8) An example of a partial but sustained contraction would be
A
tetany
B
twitch
C
all of the choices are correct
D
muscle tone
9) Compared to skeletal muscle, smooth muscle
A
contracts more slowly and relaxes more rapidly
B
contracts more slowly and relaxes more slowly
C
contracts more rapidly and relaxes more slowly
D
contracts more rapidly and relaxes more rapidly
10) A motor unit includes
A
motor neurons only
B
muscle fibers only
C
several motor neurons and one muscle fiber
D
several muscle fibers and one motor neuron
*select an answer for all questions
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