A diagram of a nephron is shown - HSC - SSCE Biology - Question 25 - 2011 - Paper 1
Question 25
A diagram of a nephron is shown.
Key:
A Filtration takes place
B Water reabsorption takes place
C Glucose reabsorption takes place
D Antidiuretic hormone (ADH) has... show full transcript
Worked Solution & Example Answer:A diagram of a nephron is shown - HSC - SSCE Biology - Question 25 - 2011 - Paper 1
Step 1
Label each of the boxes on the diagram using A, B, C or D to identify the processes that take place at this location.
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Answer
The first box should be labeled as A (Filtration takes place).
The second box should be labeled as B (Water reabsorption takes place).
Step 2
Which one of the above processes (A, B, C or D) occurs due to active transport?
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Answer
C (Glucose reabsorption) occurs due to active transport as it requires energy to move glucose against its concentration gradient.
Step 3
Outline the effect of aldosterone on the control of body fluids.
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Answer
Aldosterone is a hormone that regulates sodium and potassium levels in the body. It promotes the reabsorption of sodium ions in the kidneys, which in turn leads to an increase in water retention.
As sodium is reabsorbed, water follows osmotically. This increases blood volume and blood pressure. Additionally, aldosterone enhances the excretion of potassium, helping to maintain electrolyte balance.
