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| adolescent egocentrism | The heightened self-consciousness of adolescents. (See page(s) 306) |
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| anorexia nervosa | An eating disorder that involves the relentless pursuit of thinness through starvation. (See page(s) 299) |
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| bulimia nervosa | An eating disorder in which the individual consistently follows a binge-and-purge pattern. (See page(s) 300) |
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| depression | Experiencing over a prolonged period of time, a range of symptoms, including fatigue, irritability, inability to make decisions, sleeping problems, lack of interest in daily activities, and suicidal thoughts. (See page(s) 301) |
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| dopamine | One of the key brain chemicals that carry and influence messages between nerve cells. (See page(s) 297) |
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| ethologists | Scientists who research the connections between animal and human behaviours. (See page(s) 305) |
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| gonads | The sex glands—the testes in males and the ovaries in females. (See page(s) 282) |
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| hidden curriculum | The moral atmosphere communicated through the school's rules, regulations, deportment, and moral orientation. (See page(s) 309) |
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| hormones | Powerful chemical substances secreted by the endocrine glands and carried through the body by the bloodstream. (See page(s) 281) |
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| hypothalamus | A structure in the higher portion of the brain that monitors eating, drinking, and sex. (See page(s) 281) |
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| hypothetical-deductive reasoning | Piaget's formal operational concept that adolescents have the cognitive ability to develop hypotheses, or best guesses, about ways to solve problems, such as an algebraic equation. (See page(s) 304) |
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| imaginary audience | Adolescents' belief that others are as interested in them as they themselves are; attention-getting behaviour motivated by a desire to be noticed, visible, and "on stage." (See page(s) 306) |
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| menarche | First menstruation. (See page(s) 281) |
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| personal fable | The part of adolescent egocentrism that involves an adolescent's sense of uniqueness and invincibility. (See page(s) 306) |
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| pituitary gland | An important endocrine gland that controls growth and regulates other glands. (See page(s) 281) |
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| puberty | A period of rapid skeletal and sexual maturation that occurs mainly in early adolescence. (See page(s) 281) |
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| service learning | A form of education intended to promote social responsibility and service to the community. (See page(s) 308) |
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| sexually transmitted infections (STIs) | Infections and diseases that are contracted primarily through sexual contact, which is not limited to sexual intercourse. Oral-genital and anal-genital contact also can transmit STIs and STDs. (See page(s) 290) |