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 central chemoreceptors.
B. The decrease in total atmospheric pressure causes a greater negative pressure in the intrapleural space, resulting in deeper and more frequent breathing.
C. The decrease in PCO2 of inspired air decreases alveolar PCO2, stimulating the peripheral chemoreceptors.
D. The decrease in PO2 of inspired air decreases alveolar and arterial PO2, stimulating the peripheral chemoreceptors.
E. The decrease in the total barometric pressure at high altitude causes hypocapnea, which stimulates peripheral chemoreceptors.
Answer: D
You might also like to view...
Which statement is FALSE:
A. Perception is the conscious awareness of external or internal stimuli. B. The cerebral cortex causes the feeling or sensation to come from the receptors being stimulated (in other words, the eyes seem to see and the ears to hear). This is called projection. C. Adaptation is an increase in sensitivity to continual stimuli. D. Generally, if pain is referred, then the area to which the pain is referred and the visceral organ involved are served by the same segment of the spinal cord. E. Phantom pain is pain that seems to come from a missing limb or other body part.
Simple squamous epithelium is located in the:
A) distal tubule. B) proximal tubule. C) ascending limb of the nephron loop (loop of Henle). D) descending limb of the nephron loop (loop of Henle).
Blood viscosity stems mainly from electrolytes and monomers dissolved in plasma
Indicate whether the statement is true or false
The function of the nasal conchae is to
A) divide the nasal cavity into a right and a left side. B) provide an opening into the pharynx. C) provide a surface for gas exchange. D) create turbulence in the air to trap small particles in mucus. E) provide an opening to the outside of the body.