in this video we're going to talk about something called bulk transport this process describes how cells take in material into and out of their compartments so the first example that we're going to go over is something called endocytosis endocytosis is the process by which cells take in material endo means internal or within one example of endocytosis is phagocytosis so this is when a cell takes in solid food it could even be an organism such as a bacteria so fago means to eat or devour so let me give you a visual illustration of that so let's say this is a cell and it's about to take in a large food particle let's use a different color to illustrate that and so the cell is going to bend around it and engulf it and then it's going to look like this so here's the cell with its normal shape here's the food particle inside and it's going to be surrounded by another membrane of phospholipids so that's a visual example of phagocytosis that's when the cell consumes large food particles or even organisms such as bacteria now another example of endocytosis is something called pinocytosis the prefix pineal means to drink so this is where a cell takes in fluid that contains solu particles and nutrients so here's a visual example of that so once again we have a cell that is about to engulf something so it's taken in fluid but dissolved in the fluid you have nutrients and solu particles and then once it takes it in you're going to have something that looks like this so those food particles will be engulfed in the membrane known as a vesicle so that's an example of pineal cytosis another type of endocytosis is something called receptor mediated endocytosis so in this type of cytosis or rather in this type of endocytosis the cell has receptors that attaches to specific molecules these are molecules with the right shape that can fit into the hook of the receptor so let me show you a picture of that because a picture is worth a thousand words as they say so these would be the receptors that wants to attach to these solute particles which i'm going to use a different color when these solute particles are attached to the receptors the cell membrane is going to close around it taking in these particles into the cell now there's one more type of bulk transport that you need to be familiar with and it is the opposite of endocytosis so this one is called exocytosis the prefix exo means outside or external so in the case of exocytosis the cell exports material outside of it so that's how it gets stuff out endocytosis is the process by which cells take in material so here's a picture of a cell and here we have a vesicle inside of it with some particles that vesicle is going to move to the membrane of the cell as it does so the vesicles that is this part that is surrounded those red dots is going to become part of the cellular membrane thus opening the membrane like this and that's going to release those particles to the extracellular fluid outside of the cell so that's an example of exocytosis that's how cells get rid of stuff so that's it for this video now you know the difference between endocytosis and exocytosis thanks again for watching