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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
Step 2
Explain why the temperature near the brain decreased.
Answer
The temperature near the brain decreased because the blood, which is being cooled by the ingestion of ice-cold water, loses heat as it returns from the stomach and mouth. As a result, cooler blood flows to the brain, lowering its temperature.
Step 3
How does the thermoregulatory centre send information to sweat glands in the skin?
Answer
The thermoregulatory centre sends information to the sweat glands through nerve impulses. These impulses carry electrical signals that instruct the sweat glands to either increase or decrease sweating in response to temperature changes.
Step 4
Explain how this change helps to maintain the person’s normal body temperature.
Answer
As the rate of sweating increases, more sweat evaporates from the skin. This evaporation process helps to cool the body, ensuring that less heat is retained and allowing the individual's body temperature to remain stable despite external temperature fluctuations.
Step 5