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Copyright © 2008 Pearson Prentice Hall Inc.
Copyright © 2008 Pearson Prentice Hall Inc.
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Copyright © 2008 Pearson Prentice Hall Inc.
Copyright © 2008 Pearson Prentice Hall Inc.
Unit 1 – Homeostasis Introduction
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Copyright Pearson Prentice Hall I will understand how feedback loops in the endocrine system regulate homeostasis in the body. MT: Organ Systems Slide of 44 End Show Copyright Pearson Prentice Hall

Control of the Endocrine System Q: How does the endocrine system maintain homeostasis? A: Feedback loops that increase or stop a process from occurring. Slide of 44 End Show Copyright Pearson Prentice Hall

Copyright Pearson Prentice Hall 39-1 The Endocrine System Feedback Loops 1.Negative Feedback 2. Positive Feedback stops a cycle increases a cycle - +- Slide of 44 End Show Copyright Pearson Prentice Hall

Parts of Endocrine System Regulated by Feedback Loops

Example of Negative Feedback in Body high blood sugar levels glucagon releases sugar into blood pancreas cells alerted pancreases releases glucagon pancreas secretes insulin into blood brain tells pancreas to stop releasing insulin insulin allows cells to absorb sugar blood sugar level drops

+ + Example of Positive Feedback in Body 1. Damaged blood vessel 2. Collagen in vessels trap platelets in blood 3. Platelets release clotting factors in blood + 4. Clotting factors cause more platelets to get trapped in collagen + 5. Platelets release more clotting factors 6. Get a blood clot

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