endocrine system pp 1031-1042 warm-up 4/15: a.describe the function of the endocrine system. b.what...
DESCRIPTION
HORMONES Amino acid-based hormones: first messenger binds to cell surface receptor causing second messenger inside the cell to initiate cell activityTRANSCRIPT
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ENDOCRINE SYSTEMpp 1031-1042
Warm-up 4/15: a. Describe the function of the
Endocrine System.b. What tissues/ organs are part of
the endocrine system?
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FUNCTION
• Controls body function with chemical messengers
• Hormones: chemical messengers• Glands: secrete chemicals/hormones
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HORMONES
• Amino acid-based hormones: first messenger binds to cell surface receptor causing second messenger inside the cell to initiate cell activity
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• Steroid hormones: diffuse through cell membrane to bind to a protein which starts transcription
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GLANDS• exocrine: secrete nonhormonal chemicals
through ducts (sweat, saliva, mucous, digestive, etc)
• endocrine: secrete hormones into the bloodstream a. gonads: sex hormones b. thyroid: metabolism c. adrenal gland: adrenaline d. pituitary: hormones that affect other glands and growth hormones e. pancreas: insulin and glucagons to regulate sugar f. thymus: stimulates formation of T-cells
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FEEDBACK MECHANISMS
• Homeostasis: stable internal environment• Last step of the series controls the first
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NEGATIVE FEEDBACK
• A secondary substance inhibits production of the initial stimulating substance
A = InsulinB = glucagon (sugar)
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Negative feedback loops are necessary for homeostasis.
Negative Feedback Loop
Holding breath, CO2 levels rise,
Control system forces exhale, inhale
O2 / CO2 level returns to normal
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POSITIVE FEEDBACK
• A secondary substance stimulates production of the initial stimulating substance
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Birth
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HW
• Worksheet: Nervous and Sense Organs (Due Tuesday)
• Trifold Vocab: homeostasis, neuron, gland, hormone, positive feedback loop, negative feedback loop, synapse, neurotransmitter (Due Wednesday)