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The diagram shows the body's response to dehydration - Edexcel - GCSE Biology - Question 5 - 2014 - Paper 1
Question 5
The diagram shows the body's response to dehydration. dehydration brain thirst hormone response kidney (a) Use the diagram to help explain the body's hormonal ... show full transcript
Worked Solution & Example Answer:The diagram shows the body's response to dehydration - Edexcel - GCSE Biology - Question 5 - 2014 - Paper 1
Step 1
Use the diagram to help explain the body's hormonal response to dehydration.
Answer
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Identify Dehydration as the Trigger: Dehydration signals a deficit of fluid in the body, which impacts normal physiological functions.
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Brain Signals Thirst: The brain detects dehydration and triggers the sensation of thirst, prompting the individual to drink fluids.
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Hormone Response Initiated: Concurrently, the brain signals the release of hormones, particularly antidiuretic hormone (ADH), from the pituitary gland.
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Kidney Function Modulation: ADH acts on the kidneys to increase water reabsorption in the renal tubules, thereby reducing urine output and conserving water to restore fluid balance in the body.