Hi y'all! I wanted to emphasize the importance of, frankly, the cell membrane! Without it, we would literally be slush. Actually, we wouldn't exist! Okay, that's a bit harsh. Well, let's get started.
The amazing cell membrane:
It has a chain of phospholipids that have a hydrophilic (loves water) head, but a hydrophobic (hates water) tail, which causes it to have a stream with the heads out and tails in, which is great, because water is pretty much everywhere!
It has it on both sides, so it makes a sort of bridge-shape to it.
As I said, the tail (in) is hydrophobic, so, in order to get those necessary H2O molecules through, special proteins called aquaporins let the molecules into the cell.
Glucose is necessary for the mitochondria (The mighty powerhouse of the cell) to make adenosine triphosphate (let's just stick with ATP), so it has to let it in somehow. That somehow is called PASSIVE TRANSPORT. It goes into these protein channels that lets it through.
What if the molecule (glucose, H2O, anything) needs to get back through the membrane to grab its forgotten phone or something? Well, first off, molecules don't have phones. Second off, that's what the mighty adenosine triphosphate is for! Sorry, I meant ATP. It can get back through using ACTIVE TRANSPORT! It uses up the $MONEY OF THE CELL, the ATP, to get the job done!
Okay, well, that pretty much covers the basic schematics of the wondrous cell membrane! Enjoy, and leave a comment below!