 Just like last time we did all of our passive Transport on the previous like on one page. So it was all in one spot We're gonna do all of our active transport on one page. You already know It's active transport because it's moving things against The concentration Gradient that's that's why it counts as active transport Somehow we move things against big concentration gradient. You should immediately say How how can it do that? How can it move something? Against the concentration grading because we saw that little diffusion simulation We we never we could let that go all day. In fact, it might still be going on my computer right now And it will never return to that original state Where all the blue molecules were on one side and all the red molecules were on the other it will I mean? I guess there's like one in a gajillion for nearly and burn million possible Maybe it could happen, but it would be Very very very rare, and I would say I don't believe you if you told me it happened So how do we move things? How would we put them back without if we didn't have a little button to push? How do we move things against the concentration gradient key here is it requires? energy and the difference between primary active transport and secondary active transport the difference between them is Where the energy comes from Okay with primary active transport molecules are pumped against the concentration gradient using a ATP as the energy source and Because I think we talked about ATP when we talked about nucleotides, so I think you've heard of ATP a denicine triphosphate is quite possibly the most important molecule for cellular function is It just us or is it all animal? I don't know who all uses ATP but it's It's clutch. It's gold if you have ATP you have energy to make things happen and primary active transport is one of the biggest uses of ATP we pump we get rid of stuff that we don't want that we keep producing like Well, I was about to say carbon dioxide, but that's a really bad example because that just diffuses across the sun membrane But if there is something that we need to get rid of we can do that using ATP and Primary active transport I I want to say They both require energy But do you also? Like you didn't lose the fact that they also require a carrier, right? Both of them that you can't do Any kind of active transport unless you have a carrier so visualize those little Pac-Man dudes And now visualize Okay This little Pac-Man dude will push things Against the concentration gradient But only in exchange for ATP Give me a little ATP and I'll hook you up and send you through the cell membrane Against your concentration gradient Okay, I think that's all I want to tell you Maybe I'll tell you one more thing Primary active transport is Easier to understand than secondary active transport Make sure you understand primary under prep Primary active transport before you hit next make sure you're cool. I Need ATP. I can use ATP to push molecules against their concentration gradient This is so cool. I can use ATP to create a Concentration gradient Did you did you hear that? I have to write that down. That's really phenomenal Primary active transport can Create maybe all of them all active transport can create a Concentration gradient That's actually cool. I hadn't ever thought about that before diffusion Eliminates the concentration gradient like if you let whether it's facilitated or simple It eliminates a concentration gradient. The natural move of all things is to eliminate concentration gradients primary and secondary active transport Create concentration gradients. We actually make them and can use the the carriers To keep them and when I tell you what secondary active transport does you might see like oh Concentration gradients might come in handy