Which of the following responses to a fall in arterial pressure accounts for the ability of the kidneys to autoregulate GFR?
A. decreased resistance of the efferent arteriole
B. increased delivery of fluid to the end of the proximal tubule
C. increase resistance of the afferent arteriole
D. increased [NaCl] in tubular fluid at the macula densa
E. decreased resistance of the afferent arteriole
ANS: E
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The mechanism that establishes the medullary osmotic gradient depends most on the permeability properties of the ________
A) collecting duct B) glomerular filtration membrane C) nephron loop D) distal convoluted tubule
Following severe loss of blood, how long does it take for red blood cells to be replaced?
a. a few hours b. at least 1 day c. at least 1 week d. at least 1 month e. about 45 days
In the plasma membrane the polar ends of the phospholipid molecules are hydrophobic
Indicate whether the statement is true or false
The substrate binds to the ________ of the enzyme.
A. active site B. neutral site C. allosteric site D. acidic site