Refer to the table above. Because the shark rectal gland functions only when ATP molecules are present, what can you infer about the movement of Na+, K+, and Cl-?
A) Movement of these ions from circulation into the rectal gland is an active process.
B) Movement of these ions takes place from a region of higher concentration to a region of lower concentration.
C) These ions move into the rectal gland down their concentration gradient.
D) The rectal gland is unable to concentrate these ions.
Answer: A
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