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Figure 16 shows the urinary system of a human - Edexcel - GCSE Biology - Question 7 - 2018 - Paper 1
Question 7
Figure 16 shows the urinary system of a human. (a) Name the structures labelled P and Q. P ________________ Q ________________ The kidney contains nephrons. Fig... show full transcript
Worked Solution & Example Answer:Figure 16 shows the urinary system of a human - Edexcel - GCSE Biology - Question 7 - 2018 - Paper 1
Step 2
Explain the difference in the concentration of protein in the blood plasma and in the filtrate in the nephron.
Answer
The concentration of protein in the blood plasma is higher than in the filtrate within the nephron. This is because proteins are large molecules that cannot pass through the filtering membrane in the nephron during the process of ultrafiltration.
Step 3
Explain how glucose moves from the blood plasma into the nephron.
Answer
Glucose moves from the blood plasma into the nephron through the process of filtration. This occurs due to the high pressure in the glomerulus, which allows smaller molecules like glucose to pass through the partially permeable membrane and into the Bowman’s capsule.
Step 4
Describe how dialysis removes unwanted substances from the blood.
Answer
Dialysis removes unwanted substances through a dialysis membrane that separates the blood from dialysis solution. During the process, unwanted substances such as urea, alcohol, and excess salts move from the blood into the dialysis fluid down their concentration gradient, thereby cleaning the blood.