Homeostasis and Transport

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Presentation transcript:

Homeostasis and Transport

Concentration The amount of solute in a solution. Often measured as a percentage. Deciding factor as to where particles move.

Passive Transport Movement of particles that does not require energy. Diffusion Osmosis Facilitated Transport

Diffusion When particles move from an area of high concentration to an area of low concentration. Seeks to reach equilibrium Equilibrium: when the concentration of solute is the same through out the system. Even when equilibrium is reached, particles will continue to move (even exchange)

Diffusion, cont.

Osmosis The diffusion of water through a selectively permeable membrane. For example, sugar molecules can’t fit through the cell membrane, therefore, the water moves instead.

Osmosis Ex: Same concentrations

Osmosis Ex: salt water plant in freshwater

Osmosis Ex: freshwater plant in saltwater

Facilitated Diffusion Occurs when proteins in the cell membrane move molecules across the membrane. Helps to “facilitate” or help the movement of sugar molecules. http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html