1.4 Membrane transport

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1.4 Membrane transport

1.4  Membrane transport

Concept mapping of the 1.4 Membrane Transport

Knowledge control of 1.4 Membrane Transport

1.4 Past Paper Questions/ Worksheets

1.4 Presentation

1.4 Video / Animation

Essential idea:

 

1.4.1 Membranes control the composition of cells by active and passive

transport.

 

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

 

Understandings:

 

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

Diffusion

Osmosis

Useful tutorial on diffusion and osmosis

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

Phagocytosis

Article,Directing Traffic: How Vesicles Transport Cargo

 

Applications:

 

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

osmosis.

 

Diffusion and Osmosis Lab

 

Skills:

 

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

 

Guidance:

 

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

accurate mass and volume measurements in scientific experiments

 

Utilization:

 

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:

Biology

Topic 6.5 Neurons and synapses

 

Hemolysis and Crenation

 

Aims:

 

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.

 

1.4 Membrane Transport Presentation

1.4 Membrane Transport Video/Animation

1.4 Membrane Transport Worksheets

Membrane Transport Past Paper Questions




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