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Draw a labelled diagram to show how a specific feedback mechanism plays an essential role in homeostasis. - HSC - SSCE Biology - Question 18 - 2003 - Paper 1
Question 18
Draw a labelled diagram to show how a specific feedback mechanism plays an essential role in homeostasis.
Worked Solution & Example Answer:Draw a labelled diagram to show how a specific feedback mechanism plays an essential role in homeostasis. - HSC - SSCE Biology - Question 18 - 2003 - Paper 1
Step 1
Draw a labelled diagram.
Answer
To illustrate the process of homeostasis using a feedback mechanism, you can draw a diagram showing the feedback loop involved in thermoregulation. The diagram should include the following parts:
- Stimulus: For example, an increase in body temperature.
- Receptor: Thermoreceptors in the skin that detect changes in temperature.
- Control Center: The hypothalamus, which processes the information received from the thermoreceptors.
- Effector: Sweat glands that start to secrete sweat, and blood vessels that dilate to release heat.
- Response: A decrease in body temperature as the sweating and vasodilation take effect.
Make sure to label each component clearly in the diagram.
Step 2
Explain the feedback mechanism.
Answer
The feedback mechanism illustrated in the diagram is negative feedback. In this case:
- The stimulus (increased body temperature) is counteracted by the effector (sweat glands and blood vessels), returning the body to its set point.
- This process is vital for maintaining homeostasis, ensuring that the body remains within a narrow range of temperatures despite external changes.