The amount of air that moves in and out of the lungs with each breath is the _____.?
A) ?tidal volume
B) ?expiratory reserve volume
C) ?inspiratory reserve volume
D) ?total lung capacity
A
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Platyhelminthes can live without a circulatory or respiratory system because
A) They rely on their digestive system. B) They are dorsoventrally flattened. C) The kidney excretes excess waste materials. D) The epidermis secretes lubricants.
Factors that influence an individual's BMR (basal metabolic rate) include all of the following except
A) physical exertion. B) age. C) body weight. D) genetics. E) gender.
All of the following must occur before a second action potential can begin, EXCEPT
A) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments; the Na+ inactivation gate must open; and the Na+ activation gate must close. B) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments. C) the absolute refractory period must occur. D) the Na+ inactivation gate must open and the Na+ activation gate must close. E) None of the answers are correct.
Blocking the antigen receptors on the surface of lymphocytes would interfere with
A) phagocytosis of the antigen. B) the ability of the lymphocyte to present the antigen. C) antigen recognition. D) the lymphocyte's ability to produce antibody. E) None of the answers are correct.