Endocrine glands are made of groups of cells specialised to secrete chemicals called hormones directly into the blood.The pancreas produces insulin and glucagon to regulate blood sugar concentrations.The adrenal gland produces adrenaline which raises blood sugar level and increases the heart rate and breathing rate.The pituitary gland produces growth hormone and gonadotrophin to control the development of the ovaries and testes. It also releases ADH, which is made in the hypothalamus.