1. #37 How does the body use feedback mechanisms? #37 Warm UP How does the heat in a building know when to turn on and off? Take out Body Systems Practice

2. #37 How does the body use feedback mechanisms? HW CHECK Correct your Homework while we go through the answers. How many points did you get? (17 total)

3. #37 How does the body use feedback mechanisms? How does the body use feedback mechanisms? Feedback mechanism: when the level of one substance influences the level of another substance (stimulus  response) Negative feedback – stops and reverses the change Positive feedback – continues change MOST feedback mechanisms in the body

4. #37 How does the body use feedback mechanisms? Blood Glucose level Pancreas detects blood glucose levels and releases insulin or glucagon Diabetes is a disease where this feedback mechanism is not working properly

5. #37 How does the body use feedback mechanisms? Temperature Set point 37°C Set point 37°C hypothalamus ↑ Thyroid hormone Hair stands up Shivering Blood vessels shrink ↑ Thyroid hormone Hair stands up Shivering Blood vessels shrink ↓ Thyroid hormone Sweating Blood vessels enlarge ↓ Thyroid hormone Sweating Blood vessels enlarge Sensors in skin and brain measure body temperature

6. #37 How does the body use feedback mechanisms? Homeostasis in Plants Plants need to regulate water loss and gas exchange Use guard cells –Open / close stomate

7. #37 How does the body use feedback mechanisms? Regents Practice

8. #37 How does the body use feedback mechanisms? Activity – Regents Q’s 1.Examine the Regents Questions in the packet 2.Work with your group on the #’s assigned to your table. 3.Be ready to share your answers! Extension: 1.Organize your binder for the check Friday. 2.Log on to Study Island to try the Body Systems assignment Extension: 1.Organize your binder for the check Friday. 2.Log on to Study Island to try the Body Systems assignment

9. #37 How does the body use feedback mechanisms? Summary Let’s review the answers to the Regents Questions we finished today.

10. #37 How does the body use feedback mechanisms? 1.How do bodies use a feedback mechanism to regulate blood sugar? HOMEWORK DUE 12/8 Body Systems Practice DUE 12/16 Workbook pgs. 10-14, all questions Study Island – Body Systems and Homeostasis assignment 1.How do bodies use a feedback mechanism to regulate blood sugar? HOMEWORK DUE 12/8 Body Systems Practice DUE 12/16 Workbook pgs. 10-14, all questions Study Island – Body Systems and Homeostasis assignment REGENTS PRACTICE Reflection