ZIMSEC O-Level Biology
8.6.3Gaseous exchange (respiratory system)
Gaseous exchange (respiratory system) in ZIMSEC O-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic67 practice questions3 lessons
Overview
Form 3.
Learning objectives
What the syllabus expects you to be able to do.
- 8.6.3.1State the functions of the parts of the respiratory system and describe the mechanism of breathing in and out.
- 8.6.3.2Describe the structure of the alveoli and the factors that make gaseous exchange efficient.
- 8.6.3.3State the differences between inhaled and exhaled air and explain the effects of physical activity on breathing and pulse rate.
- 8.6.3.4Describe the short-term and long-term effects of smoking on the respiratory system, such as damage to cilia, extra mucus, bronchitis, emphysema and lung cancer.
Lessons
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Inspired and expired air, and breathing during exercise
18 min
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Smoking and health
17 min
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The breathing system and ventilation
18 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Turn Gaseous exchange (respiratory system) into a strength.
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