65. If the filtration rate described in q uestion #64 persists, which of the fol
ID: 3524655 • Letter: 6
Question
65. If the filtration rate described in q uestion #64 persists, which of the following would you expect to occur to restore the normal GFR? a. afferent arteriole dilates b. efferent arteriole dilates c. afferent arteriole constricts d. proximal convoluted tubule dilates e. nephron loop constricts 66. Alcohol acts as a diuretic because: a. it is not reabsorbed by the PCT cells. b. it increases the rate of glomerular filtration. c. it inhibits the secretion of ADH. d. it increases the secretion of aldosterone. e. it constricts the nephron loop 67. Angiotensin II causes which of the following? a. increased thirst b. increased water reabsorption c. increased excretion of potassium d increased reabsorption of sodium e. all of the above 68. Rapid reabsorption of water in the proximal convoluted tubule is dependent on the presence of: a. aquaporins b. podocytes c. vasa recta d. pedicels e. fenestrations 69. Which part of the nephron is never permeable to water? a. proximal convoluted tubule b. distal convoluted tubule c. descending thin limb of nephron loop d. ascending thick limb of nephron loop e. collecting tubule 70. The micturition reflex begins when a. osmoreceptors in the bladder are stimulated b. osmoreceptors in the ureter are stimulated c. streich receptors in the bladder are stimulated d. stretch receptors in the ureter are stimulated e. baroreceptors in the JGC are stimulatedExplanation / Answer
65. To restore normal GFR the efferent arteriole dilates. The afferent arteriole is responsible for inward movement of blood to glomerulas and efferent arteriole is responsible for outward movement of blood from the glomerulas. If the efferent arteriole dilates then the glomerular filtration rate (GFR) must be lower. So, the the correct option is b here.
66. Alcohol inhibits the secretion of ADH. We all know that ADH stands for anti-diuretic hormone. As alcohol inhibits the anti-diuretic property of ADH, so it is diuretic. Option c is the correct choice here.
67. Angiostenin II increases the cell permeability to absorb sodium. It can stimulate the adrenal cortex to secret mineralocorticoids. This mineralocorticoids increases the reabsorption of sodium.
68. Rapid reabsorption of water in the proximal convoluted tubule is dependent on the aquaporins because the cell are equipped with such water channels. So, the correct option is a here.
69. The ascending thick limb of nephron loop (loop of henle) is never permeable to water. The correct option is d here.
70. The micturition reflex begins when the stretch receptors in the bladder are stimulated. These receptors play a key role in micturition (urination) reflex. The correct choice is c here.
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