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Figure 8 shows how the concentration of substance Q in the blood is controlled by negative feedback - AQA - GCSE Biology - Question 5 - 2023 - Paper 2
Question 5
Figure 8 shows how the concentration of substance Q in the blood is controlled by negative feedback. Explain how the concentration of substance Q in the blood is co... show full transcript
Worked Solution & Example Answer:Figure 8 shows how the concentration of substance Q in the blood is controlled by negative feedback - AQA - GCSE Biology - Question 5 - 2023 - Paper 2
Step 1
Explain how the concentration of substance Q in the blood is controlled by negative feedback.
Answer
The concentration of substance Q is regulated through negative feedback mechanisms involving two hormones, A and B. If the concentration of substance Q increases beyond the ideal level, hormone A is released to lower its concentration. Conversely, when the concentration of substance Q drops too low, hormone B is activated to increase its levels back to the ideal state. This continuous monitoring and adjustment ensure that the concentration of substance Q remains within a normal range.
Step 2
Explain how the production of thyroxine causes an increase in body temperature.
Answer
Thyroxine increases the metabolic rate within the body. When thyroxine production rises, it enhances cellular respiration, resulting in increased energy release. This process generates heat as a byproduct, causing an overall increase in body temperature.