The ________ is an "incomplete endocrine gland" because it cannot produce estrogen and progesterone without the aid of precursors supplied to it by both the mother and the fetus.
A. ovary
B. uterus
C. uterine tube
D. placenta
Answer: D
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The enterohepatic circulation reabsorbs bile salts in the distal portion of the small intestine (ileum). All of the following statements about the enterohepatic circulation are true except one
Select the statement below that is not true of the enterohepatic circulation? A) Reabsorbing bile salts in the ileum gives more time to emulsify lipid and aid in their absorption within a greater length of the small intestine. B) All of the components of bile are recycled by this circulation. C) Reabsorption of bile salts reduces the need to synthesize new bile salts. D) The reabsorption of bile salts allows them to be reused within new bile.
The kidneys produce renin when
A. the urine becomes acidic. B. the peritubular capillaries dilate. C. the blood pressure in the afferent arteriole decreases. D. sodium chloride concentration in the distal convoluted tubule increases. E. the blood pressure in the afferent arteriole increases.
Which valve prevents the backflow of blood into the left ventricle when the ventricles relax?
A. Right atrioventricular valve B. Aortic semilunar valve C. Left atrioventricular valve D. Pulmonary semilunar valve E. None of the choices is correct.
Nursing babies obtain some immunity by intestinal absorption of antibodies found in their mother's milk. This process requires the movement of intact antibodies from the lumen of the intestine into the blood. This process involves a combination of
a. endocytosis. b. exocytosis. c. cotransport carriers. d. endocytosis and cotransport carriers. e. endocytosis and exocytosis.