| Unit III: Circulation |
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Specific Objectives
Students should be able to: |
Explanatory notes
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Suggested Practical Activities
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1. Explain the movement of substances in organisms
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Diffusion and osmosis.
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Experiments on diffusion and osmosis. |
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2. Discuss the need for transport systems within a living organism
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Circulatory system: necessity, SA/ volume ratio; movement in plants-transpiration, movement of nutrients, structure of stem.
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*Experiments on diffusion with agar cubes of different sizes to show how surface/ volume ratio affects total diffusion. Use osmosis apparatus to demonstrate the passage of water across a semi-permeable membrane.
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3. Discuss the structure and functions of the circulatory system in man
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Circulatory system: features of, cells and their functions; vessels, heart-structure and heart beat; names of major vessels associated with heart only. |
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4. Define blood groups A, B, AB an O
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Blood groups; antigen and antibody for each group, precaution in transfusion and handling; include spread of HIV; Rh factor-risk in pregnancy, precautions.
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5. Discuss possible causes of hypertension and heart attacks.
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Information gathering from clinics, hospitals and doctors.
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| Go to Section A: unit IV: Respiration |
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