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).
Active transport occurs in the following situations: it allows cells to take up nutrients or ions even when the concentration of substances outside the cell is very low. it allows cells to get rid of unwanted substances when their concentration is greater outside the cell. it enables the Na/K pump to work with ions moving in opposite directions.