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Flashcards in Chapter 13 Deck (5)
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1

Endocrine system

System of glands of an organism that secrete hormones directly into the circulatory system to be carried towards distant target organs

2

Adolescent growth spurt

The period during adolescence when well-nourished teens typically increase in stature at greater rates than at other times in the life cycle.

3

Essential amino acids

The 9 (of 22) amino acids that must be obtained from the food we eat because they are not synthesized in the body in sufficient amounts.

4

Senescence

Decline in physiological functioning usually associated with aging.

7

Pleiotropic genes

Genes that have more than one effect; genes that have different effects at different times in the life cycle.