Conditions in the human body must be regulated to maintain a stable internal environment. Name the process that maintains a stable internal environment. (1) Complete the sentence by putting a cross (X) in the box next to your answer. The temperature that enzymes work most effectively in the human body is: A 31°C B 33°C C 35°C D 37°C (1) Receptor cells in the skin detect temperature changes in the external environment. Explain how this information is transmitted to the brain. (4)

GCSE Edexcel Biology Homeostasis: Conditions in the human body mus

Conditions in the human body must be regulated to maintain a stable internal environment - Edexcel - GCSE Biology - Question 5 - 2012 - Paper 1

Question 5

Conditions in the human body must be regulated to maintain a stable internal environment. Name the process that maintains a stable internal environment. (1) Compl... show full transcript

Worked Solution & Example Answer:Conditions in the human body must be regulated to maintain a stable internal environment - Edexcel - GCSE Biology - Question 5 - 2012 - Paper 1

Step 1

Name the process that maintains a stable internal environment.

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Answer

The process that maintains a stable internal environment in the human body is called homeostasis.

Step 2

The temperature that enzymes work most effectively in the human body is:

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Answer

The temperature that enzymes work most effectively in the human body is D 37°C.

Step 3

Explain how this information is transmitted to the brain.

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Answer

Receptor cells in the skin detect changes in temperature. When the temperature decreases, these receptors send signals via afferent neurons to the hypothalamus, the region of the brain responsible for thermoregulation.

Detection: The receptors detect a drop in temperature and respond by generating electrical impulses.
Signal Transmission: These electrical impulses travel along sensory neurons to the spinal cord and then to the hypothalamus.
Processing: The hypothalamus processes this information, triggering appropriate responses to restore normal body temperature, such as inducing shivering or activating blood vessels to conserve heat.
Feedback: Once the body temperature rises back to the set point, the hypothalamus receives feedback and adjusts its activity accordingly.

Conditions in the human body must be regulated to maintain a stable internal environment - Edexcel - GCSE Biology - Question 5 - 2012 - Paper 1

Worked Solution & Example Answer:Conditions in the human body must be regulated to maintain a stable internal environment - Edexcel - GCSE Biology - Question 5 - 2012 - Paper 1

Name the process that maintains a stable internal environment.

The temperature that enzymes work most effectively in the human body is:

Explain how this information is transmitted to the brain.

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