Dietary amino acids in a meal that are in excess of the body's need to make protein are:
A. converted to glucose in the liver.
B. converted to fatty acids in the liver.
C. excreted without being absorbed.
D. converted to fatty acids in adipose cells.
E. burned for fuel by cells of the nervous system.
B
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When blood calcium levels are low
A. ostoclast activity increases. B. calcitonin secretion increases. C. bones produce more bone tissue. D. calcium absorption is reduced. E. osteoblast activity increases.
In a graph of wave summation, the tension level returns to baseline between each peak of force
Indicate whether this statement is true or false.
Which functional feature best describes the manner in which cardiac muscle contracts?
Automaticity (autorhythmicity) promotes the spontaneous contraction of the cardiac muscle cells. Refractory periods in cardiac contractions are relatively short. Only some motor units contract in cardiac muscle. Nerve fibers must stimulate cardiac muscle cells for them to contract.
Which of the following is a visceral sensation?
A. pain B. touch C. temperature D. proprioception E. balance