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Life Science ch 4a

Membranes 4A

Unit Membrane a thin structure composed of proteins and lipids type of membrane found around all cells and around many of the structures inside cells Membranes form the outer boundary of a cell.
selectively permeable important property of a unit membrane. Means that certain molecules go through them and other molecules do not
what easily passes through most membranes water, oxygen and carbon dioxide
how does a substance pass through a unit membrane passive transport or active transport
what are two main ways of passive transport diffusion osmosis
passive transport is the passage of substances across a membrane without the use of energy
diffusion the movement of molecules from an area of higher concentration to an area of lower concentration
what can accelerate diffusion heat,movement and pressure
osmosis is the diffusion of water through a membrane
active transport is the passage of particles through a membrane; requires the use of cellular energy (sometimes because of the size of the molecule being so large, or going against gradient)
What are some substances that are carried into and out of cells using active transport calcium, potassium, sodium
Created by: boozerclan