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OpenStudy (anonymous):
which structure is the human endocrine system made up of? a) vessels b)receptors c)glands d) chambers
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OpenStudy (girlgoyleh.):
The endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the body that regulate the activity of cells or organs.
OpenStudy (girlgoyleh.):
soo c
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