(Greek: within, inside, into, in, on, inner)
2. Any of the glands of the endocrine system that secrete hormones directly into the bloodstream.
3. The secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect.
The endocrine sites include the hypothalamus, pituitary gland, pineal gland, thyroid, parathyroids, heart (which makes atrial-natriuretic peptide), the stomach and intestines, islets of Langerhans in the pancreas, the adrenal glands, the kidney (which makes renin, erythropoietin, and calcitriol), fat cells (which make leptin).
Endocrine is as opposed to exocrine. The exocrine glands include the salivary glands, sweat glands and glands within the gastrointestinal tract.
2. A medically qualified specialist in internal medicine who has subspecialised in the diseases of glandular organs.
2. The study of hormones, their receptors, the intracellular signalling pathways they invoke, and the diseases and conditions associated with them.
2. A branch of dentistry that treats diseases and injuries affecting the root tips or nerves of teeth and treatments of the root canals are common procedures for successful dental therapy.