A patient presents with gastric acid hypersecretion. It can be explained by an increase in the plasma concentration of which of the following?
a) secretin
b) somatostatin
c) gastrin
d) gastric inhibitory peptide (GIP)
Answer: c) gastrin
You might also like to view...
Which of the following statements is true?
a. The only physiological function for which surface-area-to-volume ratio is relevant is digestion. b. The only physiological function for which surface-area-to-volume ratio is irrelevant is reproduction. c. For any physiological function, a high surface-area-to-volume ratio is advantageous. d. Surface area increases as the square of the linear dimension while volume increases as the cube. e. All statements are true.
There is a short period of time in the cardiac cycle, in which all four heart chambers are in diastole.
Answer the following statement true (T) or false (F)
The pons and cerebellum arise from which secondary embryonic vesicle?
A) Mesencephalon B) Myelencephalon C) Metencephalon D) Diencephalon E) Telencephalon
The pharmaceutical drug RU-486, typically used to treat Cushing's disease, is also sometimes used for medical abortions. RU-486 blocks progesterone production and its binding to receptors in the reproductive tract. Why would this affect pregnancy and embryonic growth?
A. Progesterone stops the corpus luteum from degrading. Without the corpus luteum, hCG (responsible for uterine growth and development) cannot be produced. B. Progesterone maintains the endometrium and prevents it from breaking down and shedding in a normal menstrual period. It also assists in stopping uterine contractions until birth. C. Progesterone stimulates release of aldosterone from the adrenal cortex. Without aldosterone, fluid is lost through the kidneys and causes high blood pressure in the uterus, which is fatal to the fetus. D. Progesterone stimulates the ovaries to produce LH, which then causes hCG production. Production of hCG is needed to inhibit pituitary FSH secretion, which induces menstrual periods.