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IGCSE Biology 0610 Revision Note 5 Movement in and out of cells R102,66   Add to cart

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IGCSE Biology 0610 Revision Note 5 Movement in and out of cells

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This revision notes provide detailed explanations, clear and concise pictures and concepts to help users understand the topic of IGCSE GCSE 0610 Biology movement in and out of cells.

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  • March 26, 2024
  • 9
  • 2023/2024
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A. DIFFUSION


Substances move into and out of cells by DIFFUSION
through the CELL MEMBRANE


particle
(e.g. sugar, salt) cell membrane
(selectively permeable)




The net movement of particles from a higher to lower concentration,
down a concentration gradient due to their random movement


The energy for diffusion comes from the particles’ kinetic energy
during their random movement
It does not come from respiration.



• Diffusion needs a concentration gradient.

• It does not need a cell membrane (think of spraying perfume in a room).

• However, in our body, particles do diffuse across a cell membrane.

, B. CONCENTRATION GRADIENT



HIGHER CONCENTRATION GRADIENT LOWER CONCENTRATION GRADIENT




OUTSIDE CELL INSIDE CELL OUTSIDE CELL INSIDE CELL

The DIFFERENCE in CONCENTRATION (across the CELL MEMBRANE is known as the CONCENTRATION GRADIENT


HIGHER CONCENTRATION GRADIENT =

LARGER DIFFERENCE IN CONCENTRATION ACROSS THE MEMBRANE =

FASTER DIFFUSION

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