In the proximal tubule, hydrogen ions are transported into the filtrate by
A) Na+/H+countertransporters only.
B) H+ primary active transporters only.
C) H+/Cl- cotransporters only.
D) both Na+/H+ countertransporters and H+ primary active transporters.
E) both Na+/H+ countertransporters and H+/Cl- cotransporters.
Answer: D) both Na+/H+ countertransporters and H+ primary active transporters.
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A) lack structural differences. B) can distinguish at least fifty primary smells. C) can distinguish from among thousands of chemical stimuli. D) contains receptor populations with different sensitivities. E) are a rare example of neuronal replacement.
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In which direction do the ureters head as they descend?
A. posteriorly and medially B. posteriorly and laterally C. anteriorly and laterally D. anteriorly and medially
Which of the following is not a function of membrane proteins?
a. Transport of polar molecules b. Transport of H+ into the cell c. Binding sites for vesicles d. Cell recognition e. Passageway for water molecules