The diagram below represents one part of the negative feedback response that occurs when a person is dehydrated - NSC Life Sciences - Question 3 - 2016 - Paper 1
Question 3
The diagram below represents one part of the negative feedback response that occurs when a person is dehydrated.
The decrease in blood volume, as a result of the ex... show full transcript
Worked Solution & Example Answer:The diagram below represents one part of the negative feedback response that occurs when a person is dehydrated - NSC Life Sciences - Question 3 - 2016 - Paper 1
Step 1
Identify the: (a) Hormone X
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Answer
Hormone X is Antidiuretic Hormone (ADH).
Step 2
Identify the: (b) Endocrine gland that secretes hormone X
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Answer
The endocrine gland that secretes hormone X is the Hypothalamus.
Step 3
Identify the: (c) Target organ
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Answer
The target organ for hormone X is the Kidneys.
Step 4
Describe the negative feedback response that occurs when a person is dehydrated, after it has been detected by the brain.
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When dehydration is detected by the brain, it triggers the release of ADH from the hypothalamus. ADH acts on the kidney tubules, making them more permeable to water. This leads to increased water reabsorption into the bloodstream, which helps to restore blood volume. Consequently, less urine is produced, and the urine that is produced becomes more concentrated. This negative feedback helps to alleviate dehydration by conserving body water.
