Photo AI
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
When the body experiences dehydration, the brain detects a decrease in water levels. This triggers a sensation of thirst, prompting the individual to seek out and consume fluids.
In response to dehydration, the brain also signals the release of hormones, such as antidiuretic hormone (ADH), from the pituitary gland. These hormones signal the kidneys to reabsorb more water back into the bloodstream, reducing the amount of water excreted in urine.
Ultimately, this hormonal response helps to conserve water in the body, rehydrate tissues, and restore the body's fluid balance.