ZIMSEC O-Level Biology
6Animal science
In this topic
Lessons
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Absorption and assimilation
20 min
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Chemical digestion and digestive enzymes
18 min
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Diffusion and active transport
24 min
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Malnutrition and deficiency diseases
22 min
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Nutrients and a balanced diet
22 min
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Teeth and physical digestion
22 min
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The digestive system
18 min
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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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Anaerobic respiration
15 min
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Respiration and aerobic respiration
18 min
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Blood
16 min
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Blood vessels
20 min
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Coronary heart disease and high blood pressure
20 min
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The heart and circulation
22 min
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Immunity and vaccination
24 min
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Contraception
18 min
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Fertilisation, pregnancy and the placenta
21 min
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Human reproductive systems and gametes
22 min
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Sample question
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