ZIMSEC O-Level Combined Science
7.1.4.1Air, breathing and gaseous exchange
Air, breathing and gaseous exchange in ZIMSEC O-Level Combined Science: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic66 practice questions3 lessons
Overview
Forms 1 to 3.
Learning objectives
What the syllabus expects you to be able to do.
- 7.1.4.1.1State the composition of air and identify the respiratory gases.
- 7.1.4.1.2Describe the tests for carbon dioxide and oxygen.
- 7.1.4.1.3Label the parts of the respiratory system and describe the breathing mechanism.
- 7.1.4.1.4Compare inhaled and exhaled air.
- 7.1.4.1.5Describe gaseous exchange in the alveoli and how alveoli are adapted for it.
Lessons
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Inspired and expired air, and breathing during exercise
18 min
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Tests for gases
25 min
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The breathing system and ventilation
18 min
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Sample question
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