endocrine glands__________ Chemical substance
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Endocrine glands - secrete chemical substances called hormones directly into the bloodstream for transport to target tissues. There are more than 20 steroid hormones in the body, ie. cortisol, cortisone, estrogen, progesterone, testosterone. Steroids are produced by the gonads (sex hormones) and by the adrenal cortex.
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hormones
The endocrine system consists of a series of glands that produce chemical substances known as hormones. Like neurotransmitters, hormones are chemical messengers that must bind to a receptor in order to send their signal.
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