The branch of physiology and medicine concerned with endocrine glands and hormones.

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.

https://en.wikipedia.org/wiki/Endocrine_gland

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