Movement of molecules
- Created by: Ammara.j
- Created on: 10-10-16 16:37
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- Movement of Molecules
- Types of fluids
- ICF (Intracellular fluid)
- This is the fluid found inside of cells. Makes up 66% of body water (2/3)
- ECF (Extracellular Fluid)
- This is the fluid found outside of cells. Makes up 1/3 of body water. 75% of that is in the interstatial fluid. 25% is in the plasma.
- ICF (Intracellular fluid)
- Diffusion
- Diffusion-The random movement of molecules from an area of high concentration to a low concentration until equilibrium is reached.
- Properties of diffusion
- Diffusion occurs at a higher rate over smaller distance than over larger distances. The equation for rate it is: Diffusion time (Distance)^2
- Dependent on temperature. Higher temp = faster rate of diffusion
- Passive. Doesn't use energy from external sources e.g the surroundings. Only K.E in molecules.
- Larger Surface area means more diffusion than a smaller
- The medium. Diffusion occurs at a higher rate in air than water
- Mass, membrane permeability and concentration gradient also effect diffusion.
- Flux- The movement of molecules in one direction. one place to another.
- Osmosis
- Osmosis is the movement of water from a higher concentration to a lower concentration across a partially permeable membrane.
- Osmolarity
- Hyper osmotic- Higher concentration of solute
- Iso osmotic- Same concentration of solute
- Osmolarity-Number of particles of solute per litre of solution.
- Types of fluids
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