1. Name the part of the body which releases antidiuretic hormone (ADH) into the blood - AQA - A-Level Biology - Question 9 - 2022 - Paper 2
Question 9
1. Name the part of the body which releases antidiuretic hormone (ADH) into the blood.
2. Alcohol decreases the release of ADH into the blood.
Suggest two signs or ... show full transcript
Worked Solution & Example Answer:1. Name the part of the body which releases antidiuretic hormone (ADH) into the blood - AQA - A-Level Biology - Question 9 - 2022 - Paper 2
Step 1
Name the part of the body which releases antidiuretic hormone (ADH) into the blood.
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Answer
The part of the body that releases antidiuretic hormone (ADH) into the blood is the posterior pituitary.
Step 2
Suggest two signs or symptoms which may result from a decrease in ADH.
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Answer
Dehydration/thirst due to reduced water retention.
Frequent urination or less concentrated urine because the kidneys are unable to reabsorb water effectively.
Step 3
Describe the effect of ADH on the collecting ducts in kidneys.
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Answer
ADH has several effects on the collecting ducts of the kidneys:
It stimulates the addition of aquaporin proteins into the cell membranes of the collecting duct cells, increasing the permeability to water.
As a result, more water is reabsorbed back into the bloodstream, helping to concentrate the urine and reduce urine volume.
This process occurs mainly by osmosis, whereby water moves from the collecting ducts into the surrounding medullary interstitium.
