Human body temperature is controlled within very narrow limits - AQA - GCSE Biology - Question 10 - 2021 - Paper 1
Question 10
Human body temperature is controlled within very narrow limits.
Scientists investigated the effect of drinking ice-cold water on:
- internal body temperature
- the r... show full transcript
Worked Solution & Example Answer:Human body temperature is controlled within very narrow limits - AQA - GCSE Biology - Question 10 - 2021 - Paper 1
Step 1
What is this person's normal internal body temperature?
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Answer
The person's normal internal body temperature is the standard average for a healthy adult, which is typically around 37.0 °C. In the given options, the appropriate choice would be 37.4 °C, reflecting a healthy internal body temperature.
Step 2
Explain why the temperature near the brain decreased.
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Answer
The temperature near the brain decreased because the cold water consumed caused the blood in the stomach and mouth to cool. This cooled blood then flows to the brain, resulting in a temperature reduction in that area.
Step 3
How does the thermoregulatory centre send information to sweat glands in the skin?
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Answer
The thermoregulatory centre sends information to the sweat glands via nerve impulses. These signals travel through the nervous system, allowing the body to initiate the sweating response.
Step 4
Explain how this change helps to maintain the person's normal body temperature.
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Answer
The increase in sweating helps to cool the body down. As sweat evaporates from the skin surface, it removes excess heat, thus preventing the body's temperature from rising too high, which is crucial for maintaining homeostasis.
Step 5
What causes the skin to appear red?
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Answer
The skin appears red due to the dilation of blood vessels in the skin. This process increases blood flow to the surface of the skin, which helps in regulating temperature during exercise.
