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The major glands of the endocrine system are the pineal gland, pituitary gland, thyroid and parathyroid glands, adrenal glands, pancreas, thymus, ovaries, and testes. There are also other organs in the body that have secondary endocrine functions.These organs include the heart, liver, and kidneys. Hormones can be regulated by other hormones, by glands and organs, and by a negative feedback mechanism. In negative feedback, the initial stimulus is reduced by the response it provokes.he major glands of the endocrine system are the pineal gland, pituitary gland, thyroid and parathyroid glands, adrenal glands, pancreas, thymus, ovaries, and testes. There are also other organs in the body that have secondary endocrine functions.
2. Endocrine glands, endocrine cells and some neurons secrete hormones into tissue fluid from which they diffuse into capillaries. Sources of hormones in humans = the endocrine system [Fig.37.2] 3. Target cells = cells with receptors for a given chemical messenger that can alter their activities in response to messenger. - Hormones are transported throughout the body by the blood, but they only elicit responses in target cells.. Endocrine glands, endocrine cells and some neurons secrete hormones into tissue fluid from which they diffuse into capillaries. Sources of hormones in humans = the endocrine system [Fig.