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Muscle System
Test Description: Part 1 review for ch 8
Instructions: Answer all questions to get your test result.
1) The kind of energy that muscles use to contract is
A
chemical
B
electrical
C
heat
2) Layers of connective tissue extending into the muscle to form partitions between muscle bundles are continuous with attachments of muscle to periosteum called
A
elastin
B
ligaments
C
tendons
D
aponeuroses
3) The union between a nerve fiber and a muscle fiber is the
A
neurotransmitter
B
neuromuscular junction
C
motor end plate
D
motor neuron
4) When the cross-bridge of the myosin molecule forms linkages with actin filaments, the result is
A
shortening of the muscle fiber
B
release of acetylcholine
C
membrane polarization
5) The ion necessary to link myosin and actin is
A
sodium
B
potassium
C
calcium
D
magnesium
6) A person feels out of breath after vigorous exercise because of oxygen debt. Which of the following statements helps explain this phenomenon?
A
conversion of lactic acid to glycogen occurs in the liver and requires energy
B
priority in energy use is given to ATP synthesis
C
all choices are correct
D
anaerobic respiration increases during strenuous activity
7) The strength of a muscle contraction in response to different levels of stimulation is determined by the
A
number of fibers that respond in each motor unit
B
characteristics of each muscle group
C
level of stimulation delivered to individual muscle fibers
D
number of motor units stimulated
8) The period of time between a stimulus to a muscle and muscle response is called the
A
latent period
B
refractory period
C
contraction
9) Muscle tone refers to
A
a state of sustained, partial contraction of muscles that is necessary to maintain posture
B
a feeling of well-being following exercise
C
the condition athletes attain after intensive training
D
the ability of a muscle to maintain contraction against an outside force
10) Peristalsis is due to which of the following characteristics of smooth muscle?
A
capacity of smooth muscle fibers to excite each other
B
rhythmicity
C
automaticity
D
both rhythmicity and the capacity of smooth muscle fibers to excite each other
*select an answer for all questions
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