Transport

= Active and Passive Transport = [|Click here for a Transport animation] [|click here to see animation on passive transport (scroll down on page)] [|Click here for an animation on Passive and Active Transport] (click Active or transport on the far left and hit continue to go through the animation)



Passive Transport is the movement of substances across a membrane. Passive transport does not require energy because it is going from an area of high transportation to an area of low transportation. There are four types of passive transport diffusion, facilitated diffusion, filtration, and osmosis.



Active Transport is the movement of substances against it's concentration gradient (from low to high concentration). Active transport requires chemical energy such as ATP because is moving against the concentration gradient.An example of active transport is sugar molecules going in to a cell. Proteins or pumps are found in the cell membrane to assist in transporting molecules across the membrane.



The Plasma membrane(cell membrane)is made of two phospholipids. The membrane has many proteins embedded in it. The plasma membrane regulates what enters and exits the cell. Many molecules cross the cell membrane by diffusion and osmosis.