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2.2 Animal tissues, organs and organ systems

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Question 19

A student compares the percentages of gases in air breathed in and air breathed out.

GasAir breathed in (%)Air breathed out (%)
Oxygen2016
Carbon dioxide0.044
a.

Calculate the difference between the percentages of oxygen in the air breathed in and the air breathed out.

[1]
b.

State the process by which oxygen moves from the air in the lungs into the blood.

[1]
c.

Use the table to state the direction in which carbon dioxide moves during gas exchange in the lungs.

[1]
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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