Endocrine System

Endocrine System What is the purpose? to regulate body activities through the use of chemicals known as hormones a hormone is a chemical produced by a gland that affects the activities of other organs or tissues

Endocrine System

hormones work through a lock-n-key system Endocrine System hormones work through a lock-n-key system

Glands and Hormones Gland Hormone Affect on the Body Hypothalamus Regulatory chemicals Regulates the activities of other endocrine glands Pituitary HGH – human growth hormone Gonad hormone Stimulates bone growth Stimulates development of sex organs Adrenals Adrenaline Increases heart rate, blood pressure and breathing rate Thyroid Thyroxine Increases rate of metabolism Pancreas Insulin Glucagon Decreases blood sugar level Increases blood sugar level Ovaries Estrogen Progesterone Produces female secondary sex characteristics Promotes growth of uterine wall Testis Testosterone Produces male secondary sex characteristics

Endocrine System Negative Feedback System – hormones work together in opposition; as one increases the other decreases to create a balance Example: In the diagram ACTH and Glucocorticoids are working in opposition to control the adrenal response; when the body is stressed more adrenaline is needed