Which of the following most accurately describes a motor unit?
A. a single muscle fiber and several motor neurons
B. a single motor neuron and all muscle fibers it innervates
C. a single muscle fiber and a single motor neuron
D. none of these answers is correct
Answer: B
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According to the U.S. Department of Health and Human Services, what is the recommended amount of physical activity an adult between the ages of 18 and 64 should engage in per week?
A. 90 minutes of moderate-intensity aerobic physical activity B. 150 minutes of moderate-intensity aerobic physical activity C. 15 minutes of vigorous-intensity aerobic physical activity D. 60 minutes of vigorous-intensity aerobic physical activity E. 150 minutes of low-intensity aerobic physical activity
Failure to achieve a maximum potential life span results from all of the following, EXCEPT
A. destructive environmental factors. B. retirement. C. destructive behavioral factors. D. physical inactivity.
Ewing's sarcoma of the subcutaneous tissues can appear as a complication of AIDS
Indicate whether the statement is true or false
Ken faces a problem of motivation to quit smoking. This likely means that that he does not ____
A) ?have the skills to quit smoking B) ?believe he can quit smoking. C) ?believe quitting is that important D) ?have the time to quit smoking E) ?have the external support to quit smoking