endocrine system: system of glands that secrete hormones. similar to nervous system, except hormones work a lot slower than neurotransmitters.
pituitary gland - secretes many different hormoes, some of which affect other glands. controlled by hypothalamus.
thyroid - affects metabolism, among other things.
parathryroid - helps regulate the level of calcium in the blood.
adrenal - inner part called medulla, helps trigger the "fight or flight" response.
pancreas - regulates level of sugar in blood.
ovary - secretes female sex hormones
testis - secretes male sex hormones.
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