The heart's valves open and close in response to changes in

A) oxygenation. B) pressure.
C) the heart's pacemaker. D) sodium and potassium concentration.

B

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_______ may take longer to process new information

a. Children b. Middle-aged men c. Older adults d. Pregnant women

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The end result of the digestion of dietary protein is

A) Oligopeptides B) Small peptides C) Amino acids D) Both A and B

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