The somatic nervous system consists of nerve fibers that connect the CNS to the ________, whereas the autonomic nervous system consists of fibers that connect the ________.
A. heart and intestines; CNS to the cardiac and smooth muscles
B. skin and skeletal muscles; brain to the spinal cord
C. visceral organs; CNS to the skin and skeletal muscles
D. skin and skeletal muscles; CNS to the visceral organs
Answer: D
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The functions of centrioles include ________
A) producing ATP B) serving as the site for ribosomal RNA synthesis C) providing a whiplike beating motion to move substances along cell surfaces D) organizing the mitotic spindle in cell division
Irritation of the muscles of the posterior aspect of the thigh can also cause irritation of the ________ nerve.
Fill in the blank(s) with the appropriate word(s).
________ muscle contraction occurs when the muscle length is relatively constant but the muscle tension changes
A) A wave summation B) An isotonic C) An isometric D) A complete tetanus
The neurons that directly innervate skeletal muscles are called
A. second-order neurons. B. lower motor neurons. C. first-order neurons. D. upper motor neurons.