Biology Tuition Singapore Secondary Science Tuition – Transport of Living Things – Diffusion

MOVEMENT OF SUBSTANCES

Diffusion

• Diffusion is the movement of any substance from its region of higher concentration to its region of lower concentration.
• It is a passive transport as energy is not required for the movement of the substance.

Diffusion in living things

• In living organisms, many organs have specialised features to improve the efficiency of diffusion of materials.
• These specialised features are mainly developed to increase the surface area so that they can carry out their functions more efficiently.
• Some examples of important diffusion of substances in living things:
• Gases exchange between the lungs and blood capillaries
• Absorption of simple food substances in the small intestine
• Gases exchange between the stomata and the atmosphere
• Uptake of mineral salts by root hairs in plants

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