QUESTION 8 How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units O b. Only by varying the firing rate of the motor neurons O c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools
QUESTION 8 How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units O b. Only by varying the firing rate of the motor neurons O c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools
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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b. The smooth muscles and glands
O c. Skeletal, smooth, and cardiac muscle
O d. The skeletal muscles and the parts of the nervous system that control them
QUESTION 8
How does the nervous system grade the force of muscle contraction?
O a. Only by recruiting additional motor units
O b. Only by varying the firing rate of the motor neurons
O c. By varying the firing rate of the motor neurons and by recruiting additional motor units
O d. By using more motor neuron pools
esc
QUESTION 9
Which is the first step in the contraction phase of the excitation-contraction coupling?
a. Action potential occurs at the neuromuscular junction.
Ob.Ca2+ binds to troponin.
Oc. Nicotinic receptor channels in the sarcolemma open.
O d. Myosin heads pivot.
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