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Movement into and out of cells - Coggle Diagram
Movement into and out
of cells
Diffusion
Diffusion is the net movement of molecules and ions from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of their random movement
Why
Particles tend to move in random directions as the collide with each other hence start to diffuse means spread out until an equilibrium is achieved.
Example
A cell with a high concentration of molecules outside and a low concentration inside. The effect of this difference in concentration is to make the molecules diffuse into the cell until the concentration inside and outside is the same.
Partial permeable membrane
A membrane that is selectively permeable, i.e. being permeable to only certain molecules and not to all molecules. An example of such membra
ne is the cell membrane wherein it allows passage of only certain types of molecules by diffusion
Diffusion of solutes
illeum
root hair cells
liver cells
Rate of diffusion
The speed with which a substance diffuses through a cell wall or cell membrane depends on
temperature
the difference between its concentration inside and outside the cell,
the size of its molecules or ions and
the surface area across which the diffusion is occurring.
Osmosis
osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell's partially permeable membrane.
Active Transport
Active transport is the process of moving molecules across a cellular membrane through the use of cellular energy.
Active transport is usually associated with accumulating high concentrations of molecules that the cell needs, such as ions, glucose and amino acids. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.