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How Diffusion Works
CONCEPTUALExplain diffusion as the net movement of particles from a region of higher concentration to lower concentration, and describe its role in moving materials (oxygen, carbon dioxide, glucose) in and between cells
Mastery Evidence
- Defines diffusion using particle theory
- Explains the direction of diffusion of oxygen and carbon dioxide at the alveoli
- Explains how cells get glucose from the blood using diffusion
- Identifies factors that affect the rate of diffusion (concentration gradient, surface area, distance)
Assessment Prompt
“If [child] was asked why oxygen moves from the lungs into the blood without the body needing to pump it, could they explain what diffusion is and why it always moves in one particular direction?”
Curriculum Standards1 alignment
KS3.Sci.Bio.GasExchange.3The national curriculum in EnglandRole of diffusion
the role of diffusion in the movement of materials in and between cells
Science · KS3
Prerequisites1
- Parts of Plant and Animal CellshardAges 11—12
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- Parts of Plant and Animal Cells hard
Diffusion in and between cells requires knowing about the cell membrane as a selectively permeable boundary
- Cells Under the Microscope hard
Understanding cell components requires first knowing that cells are the fundamental unit of life
Unlocks2
- Aerobic RespirationsoftAges 12—13
- Gas Exchange & BreathinghardAges 12—13