Decreases in blood pressure turn _____ the thirst center of the brain
A. on
B. off
A
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Why can't tetany of the heart occur?
a. there are no distinct motor units in the heart. b. there is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. c. the refractory period in cardiac muscle lasts almost as long as the duration of the resultant contraction. d. the heart contracts with maximal force every beat so it is impossible to increase the strength of cardiac contraction. e. vagal stimulation slows down the heart rate to prevent summation of contractions.
Which of the following is a correct order regarding the layers of the wall of small intestine (from inner to the outmost)?
a. Mucous epithelium to muscularis mucosae (smooth muscle layer of mucosa) to submucosa to muscularis (circular and longitudinal muscle layers) to Serosa b. Mucous epithelium to muscularis mucosae (smooth muscle layer of mucosa) to muscularis (circular and longitudinal muscle layers) to submucosa to Serosa c. Mucous epithelium to muscularis (circular and longitudinal muscle layers) to muscularis mucosae (smooth muscle layer of mucosa) to submucosa to Serosa d. Mucous epithelium to submucosa to Serosa to muscularis mucosae (smooth muscle layer of mucosa) to muscularis (circular and longitudinal muscle layers) e. Mucous epithelium to muscularis (circular and longitudinal muscle layers) to submucosa to muscularis mucosae (smooth muscle layer of mucosa) to Serosa
The tapered, conical inferior end of the spinal cord is called the conus
A. caudalis. B. finalis. C. equine. D. sacralis. E. medullaris.
Which of the following is NOT true of acute bronchitis?
A. Involves the primary and secondary bronchi B. Presents with a deep productive cough C. Produces thick fluid in the alveoli D. Usually begins with a viral URI that leads to a bacterial infection