What's up sophmores?

I hope ya'll are paying attention, here we go.

 

So the four things we need to cover are simple diffusion, facilitated diffusion, osmosis, and active transport.

 

Simple Diffusion is basically the movement of a substance across a membrane on its own. It moves from a higher concentration to a lower concentration. Think about when you start to smell perfume from accross the room and you look around wondering who sprayed it. The perfume wasn't sprayed anywhere near you but it reaches you because of diffusion.

Facilitated Diffusion still moves from a high concentration to a low concentration across the  membrane but it needs a little help from protiens to due so. 

 

Osmosis is just diffusion specifically for water.

Active Transport moves from a low concentration to a high concentration (the opposite way of diffusion). It requires energy to make the transport pssible. Energy is required to move the substance against the concentration.

 

 

 

                                                                                                (ATP=energy)