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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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Dehydration Trigger: When the body experiences dehydration, osmoreceptors in the brain detect an increase in blood osmolarity due to the loss of water.
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Signal to the Brain: The brain responds by inducing feelings of thirst, prompting the individual to seek water.
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Hormonal Response: In addition to thirst, hormones such as Antidiuretic Hormone (ADH) are released from the pituitary gland. This hormone targets the kidneys.
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Kidney Function: The kidneys then reabsorb more water back into the bloodstream, reducing urine output and helping to restore normal blood volume and osmolarity.