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| sequence in which the fastest growth occurs on top - the head - with physical growth in size working from top to bottom |
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| Sequence in which growth starts at the center of the body and moves outwards |
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| period of rapid physical maturation involving hormonal and bodily changes that takes place in adolescence |
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| A girl's first menstration |
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| powerful chemical substances secreted by endocrine gland and carried through the blood |
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| Main class of male sex hormones |
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| main class of female sex hormones |
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| An androgen that is the key hormone in males puberty development |
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| An estrogen that is a key hormone in girl's puberty |
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| Nerve cells handle information |
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| Fibers connect the brain's hemispheres |
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| front lobes that is involved in reasoning, decision making, and self control |
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| Seat of emotions in brain |
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| How many neurons at birth? |
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| Fatty substance that speeds up neuronal activity |
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