The layer of the heart that lines the atria and ventricles and forms the cuspid and semilunar valves is the:
A) myocardium
B) fibrous pericardium
C) serous pericardium
D) endocardium
Answer: D) endocardium
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Which of the following does not influence the increase in ventilation that occurs as exercise is initiated?
A) psychic stimuli B) decrease in lactic acid levels C) proprioceptors D) simultaneous cortical motor activation of the skeletal muscles and respiratory center
Vitamin ________ is a molecule synthesized partly in the skin that enhances absorption of calcium by the small intestine.
Fill in the blank(s) with the appropriate word(s).
During menses,
A) progesterone levels are high. B) a new uterine lining is formed. C) secretory glands and blood vessels develop in the endometrium. D) the old functional layer is sloughed off. E) the corpus luteum is most active.
Explain the differences among the terms paracrine, autocrine, hormone, and cytokine.
What will be an ideal response?