Which of the following effects of exercise elevate the body temperature?
A) elevated metabolism from the oxygen debt
B) an increased rate of chemical reactions
C) skeletal muscle contractions
D) all of the above
Answer: D) all of the above
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The C shape of the tracheal cartilages is important because
A) large masses of food can move through the esophagus. B) large masses of air can pass through the trachea and thus the bronchi. C) it facilitates turning of the head. D) the bronchi are also C-shaped. E) it permits the trachea to pinch shut prior to sneezing.
The average number of divisions that a human cell cultured in a dish can undergo is
A) 10-20. B) 60-100. C) 40-60. D) 30-40.
The effects of cell-mediated immunity are the result of activities of ________.
A. dendritic cells B. helper T cells C. B cells D. macrophages E. cytotoxic T cells
It is the contraction of the atria during atrial systole that completes the filling of the ventricles while the ventricles are in diastole.
Answer the following statement true (T) or false (F)