Biology Movement of Subtances in Cells

Solution

made of a solute dissolved in a solvent

solute

solid particles in solution

solvent

liquid portion of solution

diffusion

particles move from an area of high concentration to area of low concentration without needed added energy

equilibrium

same amount of particles on both sides

osmosis

diffusion of water molecules through a selectively permeable membrane

hypotonic solution

more water, less solute

hypertonic solution

less water, more solute

isotonic solution

same amount of water and solute on both sides.

60%

a cell in humans has what percent water

osmotic pressure

how much pressure to stop a flow of solvent across a membrane

facilitated diffusion

cell membrane has proteins with carrier channels that allow specific larger molecules to pass from an area of high concentration to an area of low concentration

active transport

uses transport proteins to pump small molecules and ions fro an area of low concentration to a high area

phagocytosis

cell eating cytoplasm engulfs particles and stores in food vacuoles

pinocytosis

like phagocytosis but with liquids

exocytosis

removal of a large amount of particles at once