5 Figure 9 shows a nephron from a kidney - Edexcel - GCSE Biology - Question 5 - 2023 - Paper 2
Question 5
5 Figure 9 shows a nephron from a kidney.
glomerulus
blood
Bowman’s capsule
(a) The pressure of the liquid in the Bowman’s capsule is 1.3 kPa.
The pressure of the... show full transcript
Worked Solution & Example Answer:5 Figure 9 shows a nephron from a kidney - Edexcel - GCSE Biology - Question 5 - 2023 - Paper 2
Step 1
Calculate the pressure in the glomerulus.
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Answer
To determine the pressure in the glomerulus, we multiply the pressure in the Bowman’s capsule by 5.6:
Pglomerulus=PBowmanimes5.6
Substituting the known values:
Pglomerulus=1.3extkPaimes5.6=7.28extkPa
Rounding to one decimal place gives:
Pglomerulus=7.3extkPa
Step 2
Which row of the table shows the parts of the blood that move into the Bowman’s capsule?
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Answer
The higher pressure in the glomerulus causes filtration of certain components of blood into the Bowman’s capsule. Blood cells are too large to pass through the capillary walls, whereas urea and water can. Therefore, the correct row is:
