| adrenal glands | a pair of endocrine glands just above the kidneys. The adrenals secrete the hormones epinephrine (adrenaline) and norepinephrine (noradrenaline) which help to arouse the body in times of stress |
| autonomic nervous system | the part of the peripheral nervous system that controls thet glands and the muscles of the internal organs |
| endocrine | the body's slow chemical communication systema; a set of glands that sectrete hormones into the bloodstream |
| fMRI | reveals blood flow and brain activity |
| glial cells | cells in the nervous system that support, nourish, and protect neurons |
| myelin sheath | a layer of fatty tissue that makes the message transfer more efficient |
| neural networks | interconnected neural cells. With experience, networks can learn, as feedback strengthens or inhibits connections that produce certain results |
| somatic nervous system | the division of the peripheral nervous system that controls the body's skeletal muscles. Also called the skeletal nervous system |
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