Physical Development
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| Mitochondrial theory | The theory that aging is caused by the decay of the mitochondria, which are tiny cellular bodies that supply energy for cell function, growth, and repair
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| Cellular Clock Theory | The theory that the number of times human cells can divide is about 75 to 80. As we age our cells are less able to divide.
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| Life span | The upper boundary of life, which is the maximum number of years an individual can live.
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| SIDS | Condition that occurs when an infant stops breathing, usually during the night, and suddenly dies without an apparent cause.
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| Neurogenesis | The generation of new neurons.
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| Corpus collosum | A large bundle of axion fibers that connects the brain's left and right hemispheres.
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| Amygdala | A part of the brain's limbic system that is the seat of emotions such as anger.
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| Prefontal cortex | The "judgment" region reins in intense emotions but does not finish developing until at least emerging adulthood.
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| Lateralization | Specialization of function in one hemisphere or the other of the cerebral cortex.
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| Climacteric | The midlife transition during which fertility declines.
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| Puberty | A period of rapid physical maturation involving hormonal and bodily changes during early adolescence.
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| hypothalmus | A structure in the brain that is involved with eating and sexual behavior.
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| gonadotropins | Hormones that stimulate the testes or ovaries
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| Adrenal gladn | It interacts with the pitutary gland and likely plays a role in pubertal development, but less is known about its function than about sex glands.
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| Cephalocaudal | The sequence in which the fastests growth occurs at the top of the body -- the head and feature differentiation gradually working from top to bottom.
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