AO1

• The endocrine system is made up of a number of glands that release hormones directly into the bloodstream.
• The thyroid gland releases thyroxine which controls the rate of metabolism and increases heart rate.
• The pituitary gland is the master gland of the endocrine system.
• The pituitary gland controls the release of hormones from all other endocrine glands in the body.
• ACTH (stress hormone) stimulates the adrenal glands to release the hormone adrenalin directly into the bloodstream.
• Testes release testoserone and regulate male sex characteristics.
• Ovaries release oestrogen which regulates the menstural cycle.
• Exposure to stress hormones can have side effects with sex life, digestion and heart disease.