Endocrine system Human Systems Biology.

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Presentation transcript:

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) Target organs have hormone-receptor proteins that bind to hormones that arrive in blood Neurotransmitters are different because they send signals between cells

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!

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

Salivary Gland Duct

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 output (i.e. hormone) fed back is increasing the input If the feed back output opposes the input Pancreas: See page 66 about blood glucose. Kidney: See page 64 about ADH.