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27 28 29 A typical motor unit consists of A. One neuron and all of the skeletal muscle fibers it controls. B. One skeletal muscle fiber and all of the neurons that control it. C. One skeletal muscle fiber and the one neuron that controls it. D. One axon terminal branch and the myofibrils it controls. Which muscle fibers generate more force? A. Fast-twitch fibers B. Slow-twitch fibers Which muscle fibers fatigue sooner? A. Fast-twitch fibers B. Slow-twitch fibers

27 28 29 A typical motor unit consists of A. One neuron and all of the skeletal muscle fibers it controls. B. One skeletal muscle fiber and all of the neurons that control it. C. One skeletal muscle fiber and the one neuron that controls it. D. One axon terminal branch and the myofibrils it controls. Which muscle fibers generate more force? A. Fast-twitch fibers B. Slow-twitch fibers Which muscle fibers fatigue sooner? A. Fast-twitch fibers B. Slow-twitch fibers

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Question 27** A typical motor unit consists of: - A. One neuron and all of the skeletal muscle fibers it controls. - B. One skeletal muscle fiber and all of the neurons that control it. - C. One skeletal muscle fiber and the one neuron that controls it. - D. One axon terminal branch and the myofibrils it controls. **Question 28** Which muscle fibers generate more force? - A. Fast-twitch fibers - B. Slow-twitch fibers **Question 29** Which muscle fibers fatigue sooner? - A. Fast-twitch fibers - B. Slow-twitch fibers **Question 30** The nervous system avoids muscle fatigue during contraction in mixed muscles by: - A. Only recruiting slow-twitch motor units. - B. Recruiting different types of motor units in a specific sequence. - C. Only recruiting fast-twitch motor units. - D. Recruiting slow-twitch and fast-twitch motor units at the same time. **Question 31** A polysynaptic reflex has at least ___ in the reflex pathway. - A. One synapse and two neurons. - B. Two synapses and three neurons. **Question 32** The ___ reflex compensates a withdrawal reflex by making adjustments on the opposite side of the body from the stimulus. - A. Stretch - B. Tendon - C. Flexion - D. Crossed extensor
Transcribed Image Text:**Question 27** A typical motor unit consists of: - A. One neuron and all of the skeletal muscle fibers it controls. - B. One skeletal muscle fiber and all of the neurons that control it. - C. One skeletal muscle fiber and the one neuron that controls it. - D. One axon terminal branch and the myofibrils it controls. **Question 28** Which muscle fibers generate more force? - A. Fast-twitch fibers - B. Slow-twitch fibers **Question 29** Which muscle fibers fatigue sooner? - A. Fast-twitch fibers - B. Slow-twitch fibers **Question 30** The nervous system avoids muscle fatigue during contraction in mixed muscles by: - A. Only recruiting slow-twitch motor units. - B. Recruiting different types of motor units in a specific sequence. - C. Only recruiting fast-twitch motor units. - D. Recruiting slow-twitch and fast-twitch motor units at the same time. **Question 31** A polysynaptic reflex has at least ___ in the reflex pathway. - A. One synapse and two neurons. - B. Two synapses and three neurons. **Question 32** The ___ reflex compensates a withdrawal reflex by making adjustments on the opposite side of the body from the stimulus. - A. Stretch - B. Tendon - C. Flexion - D. Crossed extensor
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Muscles serve a variety of roles as Movement, the primary aim of which is to move all parts of the body. Muscle supports joints and protects them from sagging under stress in posture and joint stability.

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