<P> 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 . The hypothalamus and pituitary gland are neuroendocrine organs . </P>
<P> 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 . The hypothalamus and pituitary gland are neuroendocrine organs . </P>
where does endocrine cells release their secretion to
where does endocrine cells release their secretion to
the blood
the blood