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-consists of ductless glands
-glands secrete chemical substances called hormones: chemical signals
-secretes GH: growth hormone: stimulates & maintains blood glucose levels during fasting periods
-secretes PRO: prolactin: stimulates milk production in women
-TSH: thyroid stimulating hormone
-stimulates thyroid glands
-ACTH: adrenocorticotropic hormone: stimulates adrenal cortex
-ADH: antidiuretic hormone: stimulated by reabsorption of water by kidney
-oxytocin: stimulates uterine contractions in childbirth
2 types of cells
1. follicular cells: regular metabolic rate (T3 & T4)
2. parafollicular cells:secrete calcitonin, decrease blood calcium levels
-plays role in "fight or flight"
-secretes epinephrine & norepinephrine
-secretes sex hormones
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