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
________ 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.
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).