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2.2 Animal tissues, organs and organ systems

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Question 12

A researcher measures the urea concentration in blood just before it enters the kidneys and just after it leaves them.

SampleUrea concentration in g/L
Blood entering the kidneys0.40
Blood leaving the kidneys0.34
a.

Calculate the percentage decrease in urea concentration as the blood passes through the kidneys.

[2]
b.

Explain how the measurements support the role of plasma in transporting urea.

[2]
c.

A person's kidneys stop working. Suggest why the urea concentration in this person's blood keeps rising over the following days.

[2]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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