Specific ObjectivesBy the end of the topic, the learner should be able to:
a) Define cell physiology.
b) Correlate the membrane structure with cell physiology in relation to permeability.
c) Differentiate between diffusion, osmosis and active transport.
d) State and describe factors affecting diffusion, osmosis and active transport.(e) carry out experiments on diffusion and osmosis
f) Explain the roles of diffusion, osmosis and active transport in living organisms.
g) Explain turgor and plasmolysis in terms of osmotic pressure.
•Diffusion as demonstrated with potassium permanganate or potassiumiodide/flower dyes/coloured plant extracts/smoke.
•Experiments using visking tubing and living tissues: fresh arrowroots/cassava/sweet potatoes/leaf petioles/irish potatoes/carrots.
•Plasmolysis can be demonstrated by using any of the following: Spirogyra,epidermal cells of onion or raw eggs that have been put in dilute hydrochloric acid overnight.