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TOPIC: ENDOCRINE SYSTEM AIM: How do the organs of the Endocrine System aid in the maintenance of Homeostasis? Do Now: 1. Define the Life Process of REGULATION? 2.Compare the Life Process of Regulation to a Cell Organelle. What is the Purpose/ Function of the Endocrine System? A System of ductless glands located around the body that produce chemicals called Hormones that travel to target organs to regulate a body activity. VOCABULARY 1. Ductless: No direct Passageway 2. Hormone: Chemical secreted by an Endocrine Gland that is Specific to a target organ and will regulate some activity associated with that organ. Hormones travel through the BLOOD. 3. Target Area: Specific area or organ of the body that a Hormone will travel to and regulate a body activity. How Were Hormones Discovered? Video Clips for Biology! The Endocrine System A. Introduction pituitary gland 1. Main endocrine glands hypothalamus thyroid gland thymus gland a. Pituitary gland b. Thyroid gland c. adrenal glands pancreas (islets) Parathyroid glands d. Adrenal glands ovaries e. Pancreatic islets f. Gonads testes The Endocrine System How does the structure and function of the Pituitary Gland contribute to maintaining Homeostasis? 1. Pituitary gland: Pea shaped gland located at the base of the Brain. 2. Controlled by the Hypothalamus (Part of the Brain- This is what links the Nervous and Endocrine System) 3. Called the “Master Gland” because some of the Hormones it secretes control the secretions of other Endocrine Glands. Hormones produced by the Pituitary Gland: 1.Growth hormone (GH) 2. Thyroid-stimulating hormone (TSH) 3. Adrenocorticotrophic hormone (ACTH) 4. Follicle-stimulating hormone (FSH) 5. Luteinizing hormone (LH) 6. Prolactin (PRL) Growth Hormone: Promotes the normal development of Muscles and Bones. FSH: Follicle Stimulating Hormone Stimulates a follicle in the ovaries to mature an egg cell. TSH: Thyroid Stimulating Hormone: Stimulates the Thyroid gland to produce its hormone. Oxytocin: Stimulates contraction of the uterus during labor. What Happens if too much or too little of a Hormone is secreted? Hypersecretion: Too much Hyposecretion: Too Little YouTube - Endocrine System and Hormones THYROID GLAND How Does the Thyroid Gland aid in the maintenance of Homeostasis? Location: Neck region Hormone Produced: Thyroxin Thyroxin regulates overall Metabolism. Parathyroid glands: embedded in thyroid. Produce the Hormone Parathormone: regulates metabolism of calcium How do the Adrenal glands function in the Endocrine System? pituitary gland Secrete the Hormone Adrenalin thymus gland Fight or Flight Mechanism Increases heart rate, breathing rate, releases glucose into the blood for a quick burst of energy – super human strength. adrenal glands thyroid gland pancreas (islets) ovaries testes PANCREAS How does the Pancreas function as an Endocrine Gland to aid in the maintenance of homeostasis? Contains Special cells in a region called the ISLETS OF LANGHERANS secrete the Hormones Insulin and Glucagon. How do these hormones function? Insulin lowers Blood Sugar and Glucagon Raises Blood Sugar levels Topic: Endocrine System Aim: How do the Endocrine glands aid in the maintenance of homeostasis? Do Now: Acrostic Poem for HORMONE Homework: Text p. 632-633 Answer Q’s 24-30 & 34 pituitary gland thyroid gland thymus gland adrenal glands pancreas (islets) Ovaries testes How are the levels of Hormones controlled? Video Clips for Biology! Feedback Mechanisms PANCREAS How does the Pancreas function as an Endocrine Gland to aid in the maintenance of homeostasis? Contains Special cells in a region called the ISLETS OF LANGHERANS secrete the Hormones Insulin and Glucagon. How do these hormones function? Insulin lowers Blood Sugar and Glucagon Raises Blood Sugar levels