The intrapleural pressure must always be higher than the intrapulmonary pressure or else the lung will collapse.
a. true
b. false
Answer: b. false
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Hydrogen ions are secreted into the filtrate by
A. both the proximal convoluted tubule and the loop of Henle. B. both the collecting duct and Bowman capsule. C. loop of Henle only. D. both the loop of Henle and the distal convoluted tubule. E. both the proximal and distal convoluted tubules.
The importance of the plateau phase of the action potential of myocardial cells is in
A) enhancing the efficiency of oxygen use by the cells. B) preventing overstretching of the cells. C) regulating Ca2+ availability to the cells. D) preventing fibrillation. E) preventing tetanus.
Increased levels of carbon dioxide in the blood will result in decreased
A) heart rate. B) cardiac output. C) blood flow to the lungs. D) parasympathetic stimulation of the heart. E) sympathetic stimulation of the heart.
The uppermost portion of the pharynx is called the ____
a. oropharynx b. laryngopharynx c. nasopharynx d. fauces