Feedback Mechanisms in Biology

Based on Medicosis Perfectionalis: "Feedback Mechanisms — Your Body's Control Systems"

Name:

Date:

🔵 Part 1: Multiple Choice & Fill in the Blank

1. A feedback mechanism that opposes or reverses a change to return the body to its set point is called:

Positive feedback

Negative feedback

Neutral feedback

Amplifying feedback

2. Which of the following are examples of negative feedback in the human body? (Select ALL that apply)

Blood glucose regulation by insulin and glucagon

Blood clotting cascade

Body temperature regulation (thermoregulation)

Oxytocin release during childbirth

Blood pressure regulation

3. During positive feedback, the response _____________ the original stimulus rather than reversing it.

(amplifies / reduces / neutralizes)

amplifies

reduces

neutralizes

4. Fill in the blanks to complete the three components of a feedback loop:

Every feedback mechanism includes a _______________________ (detects change), a _______________________ (processes the signal), and an _______________________ (produces a response).

5. When blood glucose rises after a meal, the pancreas releases _______________________, which signals cells to take up glucose, bringing levels back to normal. This is an example of _______________________ feedback.

✏️ Part 2: Short Answer

6. In your own words, explain the difference between negative and positive feedback. Give one real-life body example of each.

7. Childbirth (labor) is a classic example of positive feedback. Explain how oxytocin and uterine contractions form a positive feedback loop, and why this loop eventually ends.

8. Why is negative feedback more common in the body than positive feedback? What would happen if a negative feedback system failed? Use thermoregulation as your example.

🖊️ Part 3: Diagram Activity

9. In the box below, draw and label a negative feedback loop for body temperature regulation. Your diagram must include: stimulus, receptor, control center, effector, and response. Use arrows to show the direction of the loop.

10. Using the diagram above as a model, briefly describe what happens in each step when your body temperature rises above 98.6°F (37°C).

🧠 Bonus Reflection: How do feedback mechanisms connect to the idea of homeostasis? Could the body survive without them? Write 2–3 sentences below.