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Gas exchange

Gas exchange

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Question 6

In a clinical research study investigating pulmonary fibrosis, a disease that severely limits gas exchange in the lungs, the following epidemiological data were published:

  • 68%68\%68% of all individuals who develop pulmonary fibrosis have had long-term exposure to harmful environmental dusts or asbestos.
  • 165,000165{,}000165,000 people in the population have been formally diagnosed with pulmonary fibrosis.
  • It is estimated that an additional 285,000285{,}000285,000 people have the condition but remain undiagnosed.

Calculate the total number of people in this population who are estimated to have pulmonary fibrosis (both diagnosed and undiagnosed) and have had long-term exposure to environmental dusts or asbestos. Show your working.

[3]
Markscheme

Gas exchange Questions

  1. IGCSE
  2. /Biology
  3. /Gas exchange

16 exam-style questions on Edexcel IGCSE Biology Gas exchange. Each one has a worked solution and a mark scheme showing where the marks go.

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