Facilitated diffusion
a. involves a carrier molecule.
b. requires energy expenditure.
c. is how water enters the cells.
d. both (a) and (c) above.
e. all of these answers.
A
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The upper limb and its girdle are attached rather loosely to the rest of the body. This arrangement
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By the time filtrate reaches the tip of the loop of Henle, _____ of the filtrate volume has been reabsorbed
A. 65% B. 75% C. 80% D. 95% E. 100%