Over 90% of all parasympathetic fibers are derived from cranial nerves ________
A) VII (facial)
B) XII (hypoglossal)
C) V (trigeminal)
D) X (vagus)
D
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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.
The adolescent period begins at the end of the first year and completes at puberty.
Answer the following statement true (T) or false (F)
Gas molecule(s):
A. move randomly from areas of higher partial pressure to lower partial pressure B. move until equilibrium is reached C. diffuse readily through the respiratory epithelium D. concentration is measured in terms of pressures and partial pressures. E. All of the above are true of gas molecules
Cells can respond to ________ hormone(s) at a time
A) only one B) one or two C) two D) several