Cellular Transportation

CELL MEMBRANE – (plasma membrane) Made of lipids and proteins Helps to maintain homeostasis Around ALL cells FLUID MOSAIC MODEL Selectively Permeable - membranes that allow some things through water Oxygen Carbon Dioxide

2 types of Cellular Transport 1. Passive Transport Diffusion Osmosis 2. Active Transport

1. Passive Transport Movement through a membrane which requires NO energy. Examples: Osmosis Diffusion

A. DIFFUSION Diffusion- movement of particles from an area of high concentration to low concentration Equilibrium – When particles are evenly distributed over a given space. Concentration Gradient- difference between concentrations in a space

B. Osmosis Osmosis- the passage of water from a region of high water concentration through a semi- permeable membrane to a region of low water concentration Important in maintaining homeostasis within the cells Low salt concentration High salt concentration

2. Active Transport Movement of molecules across a membrane AGAINST the concentration gradient. Carrier protein- transport protein that binds with a particle and helps it across the membrane

Needs for Active / Passive Transport Intake of vital nutrients Rid the cells of CO2 Active Transport Ridding the cells of toxins Bringing in large molecules (nutrients) that the cell needs for metabolism