The layer that is responsible for the motility that propels food and residue through the digestive tract is called the ________.
A. muscularis externa
B. mucosa (mucous membrane)
C. submucosa
D. lumen
E. serosa
Answer: A
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The coronary arteries are branches off the
A. pulmonary trunk. B. descending aorta. C. arch of the aorta. D. ascending aorta. E. None of the above
Reflux of gastric contents into the esophagus occurs because of
A. increased amounts of mucus produced by the stomach. B. increased hydrochloric acid production by the parietal cells. C. relaxation of the cardiac sphincter. D. spasms of the submucosal layer of the stomach wall. E. contraction of the pyloric sphincter.
Give the alternate terms for heart contraction and heart relaxation
A) The alternate term for heart contraction is pumping and the alternate term for heart relaxation is resting. B) The alternate term for heart contraction is pumping and the alternate term for heart relaxation is filling. C) The alternate term for heart contraction is working and the alternate term for heart relaxation is resting. D) The alternate term for heart contraction is systole and the alternate term for heart relaxation is diastole. E) The alternate term for heart contraction is diastole and the alternate term for heart relaxation is systole.
All of the following are interactions between cell mediated immunity and innate immunity, except
A. Macrophage of innate immunity present antigens to helper T cells. B. Cytokines secreted by helper T cells stimulate inflammation. C. Cytokines secreted by helper T cells stimulate phagocytosis. D. Macrophages of innate immunity present antigens to cytotoxic T cells.