1. Name the part of the body which releases antidiuretic hormone (ADH) into the blood - AQA - A-Level Biology - Question 9 - 2022 - Paper 1
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 1
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 increased water loss from the body.
Frequent urination or increased volume of urine, leading to less concentrated urine.
Step 3
Describe the effect of ADH on the collecting ducts in kidneys.
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Answer
ADH stimulates the addition of channel proteins into the membrane of the collecting ducts, which increases their permeability to water. This allows more water to be reabsorbed back into the bloodstream, resulting in the production of more concentrated urine. The process also occurs via osmosis, drawing water out of the collecting ducts into the surrounding tissue.
