Moving into and out of the blood: diffusion, osmosis and active transport
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I can explain how particles of substances move into and out of the blood by diffusion, osmosis and active transport.
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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.
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