The first event in inspiration is
A) lung inflation.
B) atmospheric pressure forces air into the respiratory tract.
C) decreased intra-alveolar pressure.
D) the diaphragm moves downward and the external intercostal muscles contract.
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Question 2) Excess calcium in the diet causes
A) cracked fingernails. B) stunted growth.
C) brittle teeth. D) deposition of calcium in soft tissue.
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Question 3) The hormone ADH promotes water reabsorption through the wall(s) of the
A) ascending limb of the nephron loop.
B) distal convoluted tubule and collecting duct.
C) proximal convoluted tubule and collecting duct.
D) descending limb of the nephron loop.
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Question 4) The volume of air that enters (or leaves) during a single respiratory cycle is the
A) vital capacity. B) inspiratory reserve volume.
C) expiratory reserve volume. D) tidal volume.
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Question 5) A simple spirometer cannot measure which of the following air volumes?
A) Vital capacity B) Residual volume
C) Expiratory reserve volume D) Tidal volume
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Question 6) Which of the following is a trace element?
A) Iron B) Chlorine C) Sulfur D) Magnesium
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Question 7) The countercurrent mechanism functions primarily in the
A) distal convoluted tubule B) nephron loop.
C) proximal convoluted tubule. D) renal corpuscle.
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Question 8) When sodium ions are reabsorbed through the wall of the renal tubule by active
transport, chloride ions are
A) secreted by active transport. B) secreted by passive transport.
C) reabsorbed by passive transport. D) reabsorbed by active transport.
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Question 9) Air entering the potential space of the pleural cavity is called
A) pulmonary ventilation. B) pneumothorax.
C) internal respiration. D) pneumonia.
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Question 10) Which of the following vitamins is necessary for producing collagen?
A) Vitamin C B) Vitamin D C) Thiamine D) Biotin
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