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3 Cards in this Set
- Front
- Back
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Diffusion is the spreading of a distance from a place of higher concentration to one of lower concentration ( ie. Down a concentration gradient) because of the random movement of particles.
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Oxygen enters a cell by diffusion
Carbon dioxide leaves a cell by diffusion diffusion of nutrients out of the small intestine into the blood. Diffusion of oxygen and carbon dioxide between the blood and the lungs. Diffusion of oxygen and carbon dioxide into and out of a leaf. |
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Concentration means how closely the particles are packed together.
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Temperature increases the rate of diffusion.
The larger the surface of a cell the faster materials can move in and out. Substances move by diffusion from higher to lower concentration. |
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Diffusion occurs when - the cell membrane is permeable to the substance and will let it through freely.
The concentration is higher on the outside than the inside. |
Active transport can only take place across cell membrane and it uses energy to push the substance up the concentration gradient. This energy is provided by respiration in the cell.
Definition.active transport is the movement of a substance across a membrane against a concentration gradient. This process needs an input of energy. |
