CELLS NOT YOUR CELL PHONE HOMEOSTASIS: LESSON 7 OVERVIEW TEKS

Transcription

1 CELLS NOT YOUR CELL PHONE HOMEOSTASIS: LESSON 7 OVERVIEW Lesson 7: Homeostasis Feedback Mechanisms Objectives: In this lesson the student will: 1. Investigate how feedback loops maintain homeostasis in the body. 2. Identify the mechanisms necessary to maintain homeostasis. 3. Relate feedback loops in the body to other feedback systems used in everyday situations. 4. Be able to label a diagram correctly showing the steps in a feedback loop. 5. Identify positive and negative feedback loops in the human body. TEKS Biology Principles of Health Science Health Science Anatomy and Physiology Pathophysiology Principles of Agriculture (c)1a, 2F, 2G, 2H,4B, 11A, 11B (c) 1D, 1E,1G, 2D (c) 1D, 1E, 12A (c)1a, 2F, 2G, 2H, 6A, 6B (c)1a, 2F, 2G, 2H, 4A, 4D, 4E (c)12b Vocabulary Considerations: Positive feedback loop Negative feedback loop Stimulus Receptor Effector Control center Content Delivery PowerPoint Presentation: Homeostasis Lesson 7 Practice Feedback loop label worksheet Evaluate Pre/Post Test: Mechanisms of Homeostasis

2 Homeostasis Lesson 7: Mechanisms of Homeostasis Pre-Test 1. Name the 2 types of feedback loops a. Negative and inhibitor b. Positive and negative c. Stimulator and increaser d. Thermostat and regulator 2. What are the 3 necessary components of a homeostatic feedback loop? a. Receptor, regulator, thermostat b. Receptor, control center, regulator c. Stimulator, control center, receiver d. Receptor, control center, effector 3. A sensor that monitors and responds to changes in the environment is called the. a. Control center b. Receptor c. Effector d. Receiver 4. Determines the level or set point at which a variable is to be maintained. Analyzes the information received by the receptor. a. Control center b. Receptor c. Effector d. Receiver 5. Provides a way for the response to get back to the stimulus and either stop it or enhance it. a. Control center b. Receptor c. Effector d. Receiver 6. True or False. Most of the homeostatic feedback mechanisms are positive feedback systems. 7. Positive feedback loops. a. Reverse or stop the response b. Enhance or increase the stimulus c. Continues to increase until the stimulus is stopped. d. Both b and c. 8. Negative feedback loops a. Are not common in the human body b. Help with blood glucose regulation.

3 c. Are like a thermostat in a house. d. Both b and c. 9. An example of a positive feedback loop is. a. Childbirth b. Blood pressure regulation c. Thermoregulation d. All of the above 10. An example of a negative feedback loop is. a. Blood glucose regulation b. Blood pressure regulation c. Thermoregulation d. All of the above

4 Feedback Loop Worksheet Label and color the mechanisms of homeostasis in the above feedback loop. Receptor= blue Control Center= orange Effector= red Using the diagram above place the correct number of the order the event occurs next to the description. Response of the effectors feeds back to influence the initial stimulus. Stimulus produces change in the variable causing an imbalance of homeostasis. Information is processed as being out of the normal limits and is sent along efferent pathways to the next mechanism to determine a response. Change is detected by the receptor Information is sent along the afferent pathways to the next mechanism to be processed.

5 Feedback Loop Worksheet Key Label and color the mechanisms of homeostasis in the above feedback loop. Receptor= blue Control Center= orange Effector= red Using the diagram above place the correct number of the order the event occurs next to the description. Response of the effectors feeds back to influence the initial stimulus. Stimulus produces change in the variable causing an imbalance of homeostasis. Information is processed as being out of the normal limits and is sent along efferent pathways to the next mechanism to determine a response. Change is detected by the receptor Information is sent along the afferent pathways to the next mechanism to be processed.

6 Homeostasis Lesson 7: Mechanisms of Homeostasis Post-Test 1. Name the 2 types of feedback loops e. Negative and inhibitor f. Positive and negative g. Stimulator and increaser h. Thermostat and regulator 2. What are the 3 necessary components of a homeostatic feedback loop? e. Receptor, regulator, thermostat f. Receptor, control center, regulator g. Stimulator, control center, receiver h. Receptor, control center, effector 3. A sensor that monitors and responds to changes in the environment is called the. e. Control center f. Receptor g. Effector h. Receiver 4. Determines the level or set point at which a variable is to be maintained. Analyzes the information received by the receptor. e. Control center f. Receptor g. Effector h. Receiver 5. Provides a way for the response to get back to the stimulus and either stop it or enhance it. e. Control center f. Receptor g. Effector h. Receiver 6. True or False. Most of the homeostatic feedback mechanisms are positive feedback systems. 7. Positive feedback loops. e. Reverse or stop the response f. Enhance or increase the stimulus g. Continues to increase until the stimulus is stopped. h. Both b and c. 8. Negative feedback loops e. Are not common in the human body f. Help with blood glucose regulation.

7 g. Are like a thermostat in a house. h. Both b and c. 9. An example of a positive feedback loop is. e. Childbirth f. Blood pressure regulation g. Thermoregulation h. All of the above 10. An example of a negative feedback loop is. e. Blood glucose regulation f. Blood pressure regulation g. Thermoregulation h. All of the above

8 Homeostasis Lesson 7: Mechanisms of Homeostasis Test-Key 1. Name the 2 types of feedback loops i. Negative and inhibitor j. Positive and negative k. Stimulator and increaser l. Thermostat and regulator 2. What are the 3 necessary components of a homeostatic feedback loop? i. Receptor, regulator, thermostat j. Receptor, control center, regulator k. Stimulator, control center, receiver l. Receptor, control center, effector 3. A sensor that monitors and responds to changes in the environment is called the. i. Control center j. Receptor k. Effector l. Receiver 4. Determines the level or set point at which a variable is to be maintained. Analyzes the information received by the receptor. i. Control center j. Receptor k. Effector l. Receiver 5. Provides a way for the response to get back to the stimulus and either stop it or enhance it. i. Control center j. Receptor k. Effector l. Receiver 6. True or False. Most of the homeostatic feedback mechanisms are positive feedback systems. 7. Positive feedback loops. i. Reverse or stop the response j. Enhance or increase the stimulus k. Continues to increase until the stimulus is stopped. l. Both b and c. 8. Negative feedback loops i. Are not common in the human body j. Help with blood glucose regulation.

9 k. Are like a thermostat in a house. l. Both b and c. 9. An example of a positive feedback loop is. i. Childbirth j. Blood pressure regulation k. Thermoregulation l. All of the above 10. An example of a negative feedback loop is. i. Blood glucose regulation j. Blood pressure regulation k. Thermoregulation l. All of the above