How are the processes of reabsorption and secretion related?
A. Materials move in opposite directions: reabsorption moves materials into the blood, whereas secretion removes them from the blood.
B. They both involve movement of material from the blood into the tubular fluid.
C. Materials move in opposite directions: secretion moves materials into the blood, whereas reabsorption removes them from the blood.
D. They both involve movement of material from the tubular fluid into the blood.
Answer: A
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