The sinoatrial node is normally the heart's pacemaker because it has the fastest spontaneous rate of diastolic depolarization
Indicate whether the statement is true or false.
TRUE
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The term lymphadenopathy refers to
A) a congenital lack or malformation of lymph nodes. B) a chronic or excessive enlargement of lymph nodes. C) accumulations of lymph in the tissue space. D) the lack of lymphocytes in peripheral circulation. E) increased numbers of circulating lymphocytes.
Histologically, the ________ is squamous epithelium supported by a sparse connective tissue layer.
A) tunica intima B) tunica media C) tunica externa D) tunica adventitia
Which of the following is a specific immune defense?
A) antibody B) interferon C) phagocytosis D) all of these
During the cephalic phase of gastric regulation, ______________.
A. the signals come primarily from short-reflexes within the enteric nervous system B. the frequency of gastric slow waves is increased C. gastric secretions are inhibited D. the likelihood of gastric slow waves to reach threshold is increased E. the stomach responds to distention