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Flashcards in Chapter 13 Deck (5)
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Endocrine system

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


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.


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.



Decline in physiological functioning usually associated with aging.


Pleiotropic genes

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