BIOLOGY FORM 1_CELL PHYSIOLOGY_Factors that affect the rate of diffusion_L3

🧬 Cell Physiology – Factors Affecting the Rate of Diffusion – Biology Form 1 Lesson 📊

Learn about the factors that influence the rate of diffusion in cells in this detailed Biology Form 1 lesson. Understand how substances move across cell membranes and what affects their speed.

💡 Key Topics Covered:

Definition of Diffusion: Movement of molecules from a region of higher concentration to a region of lower concentration

Factors Affecting the Rate of Diffusion:

Concentration Gradient: Greater difference → faster diffusion

Temperature: Higher temperature → faster molecular movement → increased rate

Surface Area of Membrane: Larger area → faster diffusion

Diffusion Distance/Thickness of Membrane: Shorter distance → faster diffusion

Nature of Diffusing Substance: Small, non-polar molecules diffuse faster than large, polar molecules

Presence of Solvents: Diffusion occurs faster in liquids than solids

Practical Examples:

Gas exchange in alveoli (lungs)

Oxygen uptake in roots of plants

Movement of nutrients in cells

Tips for answering diffusion-related exam questions

🎯 Who Should Watch:

Biology Form 1 students

Teachers preparing lesson materials

Learners aiming to master cell physiology and understand diffusion

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