1. The Na/K atpase in the shark epithelial cells of the rectal gland A.Pumps bot
ID: 144667 • Letter: 1
Question
1.
The Na/K atpase in the shark epithelial cells of the rectal gland
A.Pumps both Na and K against their concentration gradient
B.Pumps Na against its concentration gradient but K moves with its concentration gradient
C.Pumps K against its concentration gradient but Na moves with its concentration gradient
D.Pumps both Na and K down along their concentration gradient
E.None of the above
2.
The Na/K/Cl in the shark epithelial cells of the rectal gland
A.Pumps both Na and K against their concentration gradient
B.Pumps Na against its concentration gradient but K moves with its concentration gradient
C.Pumps K against its concentration gradient but Na moves with its concentration gradient
D.Pumps both Na and K down along their concentration gradient
E.None of the above
3.
The Na/K/Cl in the shark epithelial cells of the rectal gland
A.pumps both Na and Cl against their concentration gradient
B.Pumps Na against its concentration gradient but Cl moves with its concentration gradient
C.Pumps Cl against its concentration gradient but Na moves with its concentration gradient
D.Pumps both Na and Cl down along their concentration gradient
E.None of the above
4.
The Na/K atpase in the epithelial cells of the proximal tubule
A.Pumps both Na and K against their concentration gradient
B.Pumps Na against its concentration gradient but K moves with its concentration gradient
C.Pumps K against its concentration gradient but Na moves with its concentration gradient
D.Pumps both Na and K down along their concentration gradient
E.None of the above
Explanation / Answer
1.Answer is B.
It is beacuse the isolaris rectal galndgof shark was when stimulate to secrete chloride against an electrical and chemical gradient when perfused in vitro by the ophylline and/or dibutyryl cyclic AMP. Chloride secretion was depressed by quabain which inhibits Na/K ATpase.
2.Answer is B
As related to above decridescrip cholride will uphill transport into cytoplasm and Na downhill moves along its electrochemical gradient. So Na concentration gradient goes against.
3. Answer is A
According to the above decscription both Na and Cl are against there concentration gradient.
4. Answer is C.
There are 3 ions cotransporter (Na/K/Cl) and Na /K ATATPas which before mantains the sodium concentration gradient. Na is actively pumped out, while K and Cl diffuse down their electrochemical gradient through channels in the tubule wall and into the blood stream.
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