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The strength of a muscle contraction in response to different levels of stimulation is determined by the
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
The ion necessary to link myosin and actin is
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
The union between a nerve fiber and a muscle fiber is the
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
Peristalsis is due to which of the following characteristics of smooth muscle?
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
A person feels out of breath after vigorous exercise because of oxygen debt. Which of the following statements helps explain this phenomenon?
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
The kind of energy that muscles use to contract is
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
Muscle tone refers to
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
When the cross-bridge of the myosin molecule forms linkages with actin filaments, the result is
a state of sustained, partial contraction of muscles that is necessary to maintain posture
chemical
shortening of the muscle fiber
neuromuscular junction
all choices are correct
calcium
both rhythmicity and the capacity of smooth muscle fibers to excite each other
number of motor units stimulated
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