Moving into and out of the blood: diffusion, osmosis and active transport
I can explain how particles of substances move into and out of the blood by diffusion, osmosis and active transport.
Moving into and out of the blood: diffusion, osmosis and active transport
I can explain how particles of substances move into and out of the blood by diffusion, osmosis and active transport.
Lesson details
Key learning points
- Particles of substances move into and out of the blood through selectively-permeable cell membranes.
- Oxygen, carbon dioxide and other small particles move into and out of the blood by diffusion.
- Water moves into and out of the blood by osmosis, a type of diffusion.
- The net movement of particles by diffusion and osmosis is down a concentration gradient.
- Large particles are moved into and out of the blood by active transport, which requires energy.
Keywords
Selectively-permeable membrane - A membrane that will only allow some substances through and not others.
Diffusion - Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.
Net movement - The overall movement of particles.
Osmosis - The net movement of water molecules from high to low concentration through a selectively-permeable membrane.
Active transport - The net movement of particles against a concentration gradient using energy.
Common misconception
Mistakes with the definitions of diffusion, osmosis and active transport are common, as are their application to biological scenarios.
The definitions are clearly stated and contextualised using key human biological processes and examples.
Equipment
None required.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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