1.4 Membrane transport

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1.4 Membrane transport

1.4  Membrane transport

Concept mapping of the 1.4 Membrane Transport

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Essential idea:


1.4.1 Membranes control the composition of cells by active and passive



Nature of science:


1.4.2 Experimental design—accurate quantitative measurement in osmosis experiments are essential. (3.1)


Osmosis lab

Osmosis lab article

Cell transport videos especially for lab skills




1.4.3 Particles move across membranes by simple diffusion, facilitated diffusion,osmosis and active transport.


Brownian Motion animation

Passive transport

Passive and Active transport animations



Useful tutorial on diffusion and osmosis


Osmosis animation

Osmosis and turgor animation

Active transport

Transport Processes Requiring ATP

Diffusion,osmosis,active transport

Active transport animation

Cotransport animation

Proton Pump

Receptors Linked to a Channel Protein / Effect of neurotransmitters  

Potassium Exchange Pump

Membrane transport animation

Membrane transport animations


1.4.4  The fluidity of membranes allows materials to be taken into cells by endocytosis or released by exocytosis. Vesicles move materials within cells.


Endocytosis and Exocytosis


Article,Directing Traffic: How Vesicles Transport Cargo




1.4.5  Application: Structure and function of sodium–potassium pumps for active transport and potassium channels for facilitated diffusion in axons.


Cell transport (sodium/potassium pump, cotransport, proton pump, endocytosis/exocytosis)


1.4.6 Application: Tissues or organs to be used in medical procedures must be

bathed in a solution with the same osmolarity as the cytoplasm to prevent



Diffusion and Osmosis Lab




1.4.7 Skill: Estimation of osmolarity in tissues by bathing samples in hypotonic and hypertonic solutions. (Practical 2)




1.4.8  Osmosis experiments are a useful opportunity to stress the need for

accurate mass and volume measurements in scientific experiments




1.4.9 Kidney dialysis artificially mimics the function of the human kidney by using appropriate membranes and diffusion gradients.


Syllabus and cross-curricular links:


Topic 6.5 Neurons and synapses


Hemolysis and Crenation




1.4.10 Aim 8: Organ donation raises some interesting ethical issues, including the altruistic nature of organ donation and concerns about sale of human organs.


1.4.11 Aim 6: Dialysis tubing experiments can act as a model of membrane action.Experiments with potato, beetroot or single-celled algae can be used to

investigate real membranes.


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Membrane Transport Past Paper Questions

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