Reflection Chapter 6.2-6.3

• This is what I learned about, the motion of substances in the membrane. Movement in a cell does not simply consist of floating around. But instead, different substances are allowed in certain places that others may not be. Diffusion describes when substances are allowed to travel all over. While a selectively permeable membrane stops some particles from going in the direction they intended. The term passive transport describes Diffusion across a membrane, which pretty much means the particles freely float around the membrane as they wait to possibly enter without any expended energy.
• What i found difficult about what i have studied is, the concept of osmosis. I don't understand the difference between osmosis and isotonic. I know isotonic describes the equilibrium of a solvent and solute but does that mean that osmosis is only describing what it takes for the solution to become equilibrium?
• How is structure related to function?

The structure of a membrane dictates its function. Many membrane have the same content, its the way that they organize themselves that makes them have different functions. If the structure of a membrane does not turn out correctly its function will not work. For example, if a hydrophobic tail ended up facing the outside, the function may be mute because it does not like water. When the structure of a membrane is deformed or cut apart we call it denatured and is considered dead.