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    That's how WE get out and in of a building. Simple right? Well how do substances get into cells? DA DA DA! It's time for an adventure! *travels to cell*
   AHH! Why can't I get in?! LET ME IN!

   Cell membrane: HEY YOU! You can't get in here! This cell is meant only for certain molecules that are helpful for the cell! 
  Me: *runs away screaming*

   
    Okay so now onto our next topic. DIFFUSION! Here's an example:

    When someone sprays something like air freshener or perfume, it's an act of a diffusion. When the person sprays the air freshener right in front of them, that's a high concentration area. Eventually, the air freshener begins to spread around the room (with its smell too) and those places are called low concentration areas.


     There are also different types of movement. One is passive transport which requires no energy from the cell. That leads into facilitated diffusion which is means of transport to substances. entering the cell. 

      Unlike passive transport, active transport needs energy...just like in real life.  In order for you to be active, you need energy! It needs energy because it pushes the molecule along the cell membrane and the molecule can't do that by itself.

   Ugh sadly there are more complicated words! Osmosis is when water molecules are diffused across the cell membrane. Endocytosis moves things outside of the cell to the cytoplasm and Exocytosis is moving things in the cytoplasm to the outside of the cell. Okay I think we're done with the big words!


    


     
     Wait...wait...WAIT! What happens when two cells are different sizes? Does it effect the diffusion process? I sense another adventure! 
Cell membrane: The bigger the cell membrane is, the faster substances can be diffused so we can't keep track of anything getting in so membranes tend to be smaller.
Me: Thanks buddy!
  Here are some links:
CLICK FOR PASSIVE AND ACTIVE TRANSPORT!
CLICK FOR OSMOSIS!
http://www.maxanim.com/physiology/Endocytosis%20and%20Exocytosis/Endocytosis%20and%20Exocytos
is.htm
Okay well bye! *exits dramatically*