Which of the following reflect internal changes due to aging?
a) The heart's capacity to pump blood through the circulatory system to the brain is increased and more efficient due to the hardening and shrinking of blood vessels.
b) The reduction in gray matter makes the aging brain less efficient.
c) The respiratory system is more efficient with age.
d) The digestive system is less efficient pushing food through the system, which leads to constipation.
Answer: d) The digestive system is less efficient pushing food through the system, which leads to constipation.
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