1. What is it and what can it do for you?

2.  A system of ductless glands in various parts of the body that manufacture and secrete hormones into the bloodstream or lymph fluids, thus affecting cells in other parts of the body

3.  A substance manufactured and released in one part of the body that affects other parts of the body

4.  The endocrine gland located in the brain and often called the “master gland,” which releases hormones that control other endocrine glands and also releases a growth hormone  Releases the hormones that activate the other glands in the endocrine system

5.  The parathyroid hormone stimulates the following functions:  Release of calcium by bones into the bloodstream  Absorption of food by the intestines  Conservation of calcium by the kidneys

6.  Lymphocytes originate from hemocytoblasts (stem cells) in red bone marrow. Those that enter the thymus mature and develop into activated T-lymphocytes i.e. able to respond to antigens encountered elsewhere in the body. They then divide into two groups :  Those that enter the blood, some of which remain in circulation and some lodge in other lymphoid tissue  those that remain in the thymus gland and are the source of future generations of T- lymphocytes.

7.  Produces the important hormone thyroxin, which regulates the rate at which food is metabolized

8.  Regulates the body’s blood sugar levels by releasing the hormones insulin and glucagon into the bloodstream

9.  A pair of endocrine glands that release hormones that prepare the body for emergencies and stressful situations and also release small amounts of the sex hormones

10.  Sex glands –the ovaries in females and the testes in males  Release the sex hormones that make reproduction possible and that are responsible for the secondary sex characteristics

11.  Its principal hormone is melatonin, a derivative of tryptophan. Synthesis and release of melatonin is:  Stimulated by darkness  Inhibited by light  These levels appear:  To promote going to sleep and thus help insomnia  To hasten recovery from jet lag  Not to have dangerous side effects