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Endocrine system

Endocrine system. Human Systems Biology. Hormones “ Chemical Messengers”. Produced and secreted directly into the blood by endocrine glands Endocrine gland hormones are spread by blood stream throughout body to target organs (each hormone has a specific target)

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Endocrine system

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  1. Endocrine system Human Systems Biology

  2. Hormones “Chemical Messengers” • Produced and secreted directly into the blood by endocrine glands • Endocrine gland hormones are spread by blood stream throughout body to target organs (each hormone has a specific target) • Target organs have hormone-receptor proteins that bind to hormones that arrive in blood • Neurotransmitters are different because they send signals between cells

  3. Page 65 • The main glands in the Endocrine system are: • Pituitary Gland • Thyroid Gland • Parathyroid Glands • Adrenal Glands • Pancreas • Ovaries • Testes Refer to page 65, write a brief function for each gland!

  4. Types of Glands Exocrine Glands Endocrine Glands • Have ducts • Secrete products into body cavities • E.g. salivary glands secrete salivary amylase enzyme into mouth via salivary ducts • No ducts! • Secrete hormones directly into bloodstream • E.g. • Hypothalamus • pituitary • thyroid • pancreas

  5. Salivary Gland Duct

  6. Control of Endocrine Glands Endocrine glands are controlled by a “cause and effect” feedback system with inputs (reactants) and outputs (products). This is what maintains “Homeostasis” (balance) Negative Feedback Positive Feedback • If the feed back output opposes the input • Pancreas: See page 66 about blood glucose. • Kidney: See page 64 about ADH. • If the output (i.e. hormone) fed back is increasing the input

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