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Cards In This Set
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As an axon enters a muscle, it branches into a number of axonal terminals, each of which forms a neuromuscular junction with a single muscle fiber. A motor neuron and all the muscle fibers it supplies is called a:
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Motor unit
A motor unit is a nerve-muscle functional unit, with a motor neuron supplying all the muscle fibers.
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Which of the following does not occur during muscle contraction?
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Hemoglobin concentration in muscle fibers increases
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Each skeletal muscle fiber is controlled by a neuron at a single:
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Neuromuscular junction.
The axon of each motor neuron divides as it enters the muscle, and each of these axonal endings forms a branching neuromuscular junction with a single muscle fiber. As a rule, each muscle fiber has only one neuromuscular junction.
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Which of the following best describes the composition of the structure known as a triad in a skeletal muscle fiber?
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Terminal cisterna, transverse tubule, and terminal cistern
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The dense layer of collagen fibers that surround an entire skeletal muscle is the:
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Epimysium
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The space between the neuron and the muscle is the:
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Synaptic cleft.
a gel-like substance rich in glycoprotein
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Skeletal muscles are responsible for the pumping action of the heart.
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FALSE
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Which of the following substances increases in quantity during repetitive muscle contraction?
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Lactic acid
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ATP, CP, glucose, and oxygen all decrease during muscle contraction
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TRUE
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An action potential is the result of a predictable sequence of electrical changes that occurs along the length of the sarcolemma.
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TRUE
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A sarcomere is part of a:
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Myofibril.
the sarcomere is the contractile unit of the myofibril.
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Which of the following is thought to be an autoimmune disease of acetylcholine receptors?
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Myasthenia gravis
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Where does 95% of the energy needed for contraction come from during moderate exercise?
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ATP
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Anaerobic glycolysis is only used for energy during active, prolonged, vigorous exercise
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TRUE
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The alternating contraction and relaxation of opposing layers of smooth muscle is referred to as:
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Peristalsis.
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