When the level of ADH (antidiuretic hormone) increases,
A) the rate of sodium ion reabsorption in the DCT decreases.
B) more concentrated urine is produced.
C) less water is reabsorbed by the nephron and collecting duct.
D) the water content of urine increases.
E) the sensation of thirst is inhibited.
B) more concentrated urine is produced.
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Which structure connects the yolk sac to the embryonic midgut?
A. Liver bud B. Vitelline duct C. Hepatopancreatic ampulla D. Gastric duct E. Foregut dilation
Increased activity in the cells of the ventral respiratory group of the medullary respiratory center is expected to produce
A. increases in the contraction of the external intercostals muscles. B. increases in the contraction of the internal intercostals muscles. C. increased contraction of the abdominal muscles. D. All of these changes. E. no change in breathing whatever.
Bile would flow directly from the
A. gallbladder into the hepatic duct. B. hepatic ducts into the common hepatic duct. C. bile canaliculus into the cystic duct. D. common bile duct into the gallbladder. E. cystic duct into the hepatic ducts.
If the amount of progesterone in the blood remained at the level seen in the middle of the luteal phase for 6 straight months, what would the effect be on menstruation?
A. Menstruation would not occur. B. Menstruation would occur consistently for the entire 6 months. C. Menstruation would occur at the typical intervals, but would be lighter than before. D. Menstruation would occur at the typical intervals, but would be heavier than before. E. There would be no effect on menstruation.