McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What pattern of stimulation leads to summation?

A. increase in muscle mass, resulting in more powerful muscular contractions
B. frequent stimulation causes twitches to combine; muscle cannot relax completely between twitches
C. decreased frequency of stimulation, leading to muscle relaxation
D. increase in the number of activated motor units


2. Complete tetanus is due to what phenomenon?

A. a bacterial infection
B. decreased frequency of stimulation, leading to muscle relaxation
C. increase in the number of activated motor units
D. repeated stimulation of the motor unit so that twitches run together into one sustained contraction
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