Which correctly describes the cause of the increase in alveolar ventilation that occurs when a person ascends to high altitude?
A. The decrease in PCO2 of inspired air decreases alveolar PCO2, stimulating the peripheral chemoreceptors.
B. The decrease in PCO2 of inspired air decreases alveolar PCO2, stimulating the central chemoreceptors.
C. The decrease in PO2 of inspired air decreases alveolar and arterial PO2, stimulating the peripheral chemoreceptors.
D. The decrease in total atmospheric pressure causes a greater negative pressure in the intrapleural space, resulting in deeper and more frequent breathing.
E. The decrease in the total barometric pressure at high altitude causes hypocapnea, which stimulates peripheral chemoreceptors.
C
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If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what could happen?
A) The cells will lose water and shrink. B) The cells will show no change due to diffusion of both solute and solvent. C) The cells will swell and ultimately burst. D) The cells will shrink at first, but will later reach equilibrium with the surrounding solution and return to their original condition.
The larynx contains ________.
A) the thyroid cartilage B) a cricoid cartilage also called the Adam's apple C) an upper pair of avascular mucosal folds called true vocal folds D) lateral cartilage ridges called false vocal folds
Intramembranous ossification is common in children, whereas endochondral ossification is typical in young adults.
Answer the following statement true (T) or false (F)
The cusps of the AV valves are extensions of which layer of the heart wall?
A) epicardium B) parietal pericardium C) myocardium D) endocardium