Which statement about the effects of aging on the endocrine system is true?
A. The increase of estrogen and testosterone cause osteoporosis.
B. Up-regulation stops.
C. Estrogen and testosterone increase dramatically with aging.
D. Levels of hormones decline with age.
Answer: D
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The reaction rates of many chemical reactions that occur in the body are controlled by special protein molecules called ________.
Fill in the blank(s) with the appropriate word(s).
Scours, a term commonly used in livestock, is also known as:
A) diarrhea B) vomiting C) cleaning the coat D) combing the coat with a metal brush E) vitamin C deficiency
Melatonin is released in response to
A. decreased sunlight. B. going to bed earlier. C. increased sunlight. D. staying awake later into the night.
Which of the following lipoproteins contains the highest percentage of cholesterol?
A. LDL B. HDL C. VLDL D. chylomicron E. CDL