During a normal inspiration, air pressure in your alveoli (a.k.a., intrapulmonary pressure) is:
A. equal to atmospheric pressure
B. equal to intrapleural pressure
C. greater than atmospheric pressure
D. less than atmospheric pressure
E. + 3 mm Hg
Ans: D. less than atmospheric pressure
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In serving their roles as gatekeepers, epithelial tissues demonstrate selective __________
Fill in the blank with correct word.
The most delicate of the meninges consists of elastic and collagen fibers and is known as the
A. pia mater. B. dura mater. C. falx cerebri. D. arachnoid mater.
"Segmentation" within the small intestine refers to the
A. propulsion of material between the segments of the GI tract. B. division of function between the different segments of the small intestine. C. back-and-forth motion that mixes chyme with glandular secretions. D. gastroileal reflex that moves materials from the stomach to the large intestine.
During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ________.
A) a strong base B) stearic acid C) hydrochloric acid D) lactic acid