Grade: 8 - 12 | Lesson on human endocrine system. It explains the major elements in the endocrine system, and how glands produce hormones which target cells. It describes the types of hormones, and actions of ten endocrine glands - pineal, anterior pituitary, posterior pituitary, thyroid, parathyroid, pancreas, adrenal cortex, adrenal medulla, testes and ovaries.