But yeah, anywhere in your 20s is still young. Early 30s is where that ends. kingkong113 said: â. I ask this because this girl in my Precal class has been all on my dick and is clearly looking to hook up but she is like 28. but she did say and I quote My Pussy is tight though lol who says that to someone.
Active transport. Active transport is the movement of molecules across a cell membrane from a region of their lower concentration to a region of their higher concentrationâin the direction against some gradient or other obstructing factor (often a concentration gradient).
The other process is referred to as active transport because it requires the cell to expend chemical energy, typically adenosine triphosphate, commonly called ATP. Active transport occurs when a solute must pass through the cell membrane against its concentration gradient.A good analogy is that this is like pushing the water that fell over a waterfall, back up the river to the falls above. It takes a lot of energy for the cell to do this.he other process is referred to as active transport because it requires the cell to expend chemical energy, typically adenosine triphosphate, commonly called ATP. Active transport occurs when a solute must pass through the cell membrane against its concentration gradient.