the endocrine system

• Glands communicate by releasing hormones.
• Hormones are chemical messengers released into the bloodstream.
• The endocrine system communicates through hormones released into the bloodstream.
• The cells in the endocrine system group into clusters called glands.
• Glands in the brain receive electrical signals from neurons but communicate through hormones in the blood stream
• Adrenal glands are located above the kidneys and release hormones in response to stress
• The adrenal medulla releases adrenaline in response to stress. It is the inner bit of the adrenal gland
• The adrenal cortex releases cortisol in response to stress. It is the outer bit of the adrenal gland
• The pituitary gland controls the release of hormones in all other glands and releases hormones into the bloodstream, to all the other glands in the body. The pituitary gland can receive electrical signals from other neurons in the brain.
• The gland at the bottom of the brain is called the pituitary gland. The pituitary gland releases ACTH.
• For hormones to be released, a stimulus triggers a gland, causing the release of a hormone into the bloodstream. The hormone travels around the bloodstream until they reach target cells. They bind to the receptors on the target cells which causes a response in the target cell.
• The pituitary gland receives electrical signals and releases hormones.