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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
motor end plates
C
transverse tubules
D
sarcoplasmic reticulum
2) myofibrils are composed primarily of
A
tropomyosin
B
ATP and ADP
C
troponin
D
actin and myosin
3) The enzyme cholinesterase causes acetylcholine to
A
decompose
B
form cross bridges
C
be secreted from the motor end plate
D
bind to actin
4) Creatine phosphate serves to
A
supply energy for the change of ATP to ADP
B
supply energy for the synthesis of ATP
C
cause the decomposition of 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
troponin
B
ATP
C
tropomyosin
D
myosin
6) The amount of oxygen needed to support the conversion of lactic acid to glucose is called the
A
oxygen debt
B
aerobic conversion
C
anaerobic concentration
D
refractory quantity
7) a muscle cramp is likely due to a lack of
A
actin
B
ATP
C
myosin
D
ADP
8) An example of a partial but sustained contraction would be
A
twitch
B
all of the choices are correct
C
tetany
D
muscle tone
9) Compared to skeletal muscle, smooth muscle
A
contracts more slowly and relaxes more slowly
B
contracts more rapidly and relaxes more slowly
C
contracts more slowly and relaxes more rapidly
D
contracts more rapidly and relaxes more rapidly
10) A motor unit includes
A
several muscle fibers and one motor neuron
B
motor neurons only
C
muscle fibers only
D
several motor neurons and one muscle fiber
*select an answer for all questions
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