Wiley Plus Final Exam Questions With 100% Correct Answers 2024.

Wiley Plus Final Exam Questions With 100% Correct Answers 2024. What is the basic difference between endocrine glands and exocrine glands Secretions of endocrine glands diffuse into interstitial fluid and then into the blood; exocrine secretions flow into ducts that lead into body cavities or to the body surface. In the stomach, one stimulus for secretion of hydrochloric acid by parietal cells is the release of histamine by neighboring mast cells. Is histamine an autocrine or a paracrine in this situation? In the stomach, histamine is a paracrine because it acts on nearby parietal cells without entering the blood. What is the action of the receptor-hormone complex? The receptor-hormone complex alters gene expression by turning specific genes of nuclear DNA on or off. Why is cAMP a "second messenger"? Cyclic AMP is termed a second messenger because it translates the presence of the first messenger, the water-soluble hormone, into a response inside the cell. What is the functional importance of the hypophyseal portal veins? The hypophyseal portal veins carry blood from the median eminence of the hypothalamus, where hypothalamic releasing and inhibiting hormones are secreted, to the anterior pituitary, where these hormones act.