Negative Feedback Systems

Name:

Date:

Human body temperature regulation diagram

🎯 WALT & Success Criteria

We Are Learning To:

• Understand and explain negative feedback mechanisms in biological systems

• Identify examples of negative feedback in the human body

• Analyse how negative feedback maintains homeostasis

Success Criteria - I can:

☐ Define negative feedback and describe its role in maintaining stable internal conditions

☐ Explain at least two examples of negative feedback systems in the human body

☐ Complete and interpret diagrams illustrating negative feedback loops

📚 Part 1: Understanding Negative Feedback

1. Fill in the blanks to complete the negative feedback loop:

__________ → Receptor → __________ → Effector → __________ → Feedback to receptor

Word bank: Response, Stimulus, Coordinator

2. What is the main purpose of negative feedback in the human body?

To increase body temperature rapidly

To maintain stable internal conditions (homeostasis)

To speed up all body processes

To shut down body systems

3. Complete this sentence about temperature regulation:

When body temperature rises above 37°C, the body responds by _____________ and _____________ to cool down.

Sentence starter: "The body responds by..."

🔗 Part 2: Matching Activity

4. Match each negative feedback system to its correct description:

A. Temperature regulation

B. Blood glucose control

C. Water balance

1. Insulin released when blood sugar is too high

2. Sweating occurs when body gets too hot

3. ADH controls water reabsorption in kidneys

5. For blood glucose control, identify the key components:

Receptor: _________________

Coordinator: _______________

Effector: __________________

Help: Think about which organ detects blood sugar changes, which organ releases hormones, and which organ responds.

6. Explain why negative feedback is important for maintaining health:

Sentence starter: "Negative feedback is important because it helps the body..."

🚀 Extension Activity

7. Challenge Question: What would happen if the body used positive feedback instead of negative feedback for temperature control? Explain why this would be harmful.

8. Draw and label a simple diagram showing the negative feedback loop for ONE body system of your choice:

Vocabulary Glossary:

Homeostasis: Maintaining stable internal conditions in the body

Stimulus: A change in the environment that triggers a response

Receptor: Detects changes and sends signals

Effector: The part that produces the response

ADH: Anti-diuretic hormone that controls water balance

✅ Answer Key

1. Fill in the blanks to complete the negative feedback loop:

Stimulus → Receptor → Coordinator → Effector → Response → Feedback to receptor

2. What is the main purpose of negative feedback in the human body?

Answer: To maintain stable internal conditions (homeostasis)

3. Complete this sentence about temperature regulation:

Answer: When body temperature rises above 37°C, the body responds by sweating and dilating blood vessels to cool down.

4. Match each negative feedback system to its correct description:

A-2, B-1, C-3

5. For blood glucose control, identify the key components:

Receptor: Pancreas

Coordinator: Pancreas

Effector: Liver and muscle cells

6. Explain why negative feedback is important for maintaining health:

Answer: Negative feedback is important because it helps the body maintain homeostasis by regulating internal conditions, preventing extremes that could be harmful.

7. Challenge Question:

Answer: If the body used positive feedback instead of negative feedback for temperature control, it could lead to overheating and potentially fatal conditions, as the body would continue to increase temperature rather than stabilize it.

8. Draw and label a simple diagram showing the negative feedback loop for ONE body system of your choice:

Answer: Students should draw a diagram that includes a stimulus, receptor, coordinator, effector, and response, clearly labeling each part.