Biology

[liamallan123]

Hey to those who are willing to help, I am just needing some v good and easy to remember examples for osmosis, diffusion, facilitated diffusion, active transport and bulk transport. Thanks ppl

[Gogo14]

Ok, firstly lets not worry about the terms for now.
We can split movement across the membrane into 2 categories: energy requiring and no energy requiring.
For energy requiring movement, there is active transport and bulk transport. They are both transporting substances across the membrane, hence requiring energy. Bulk= large stuff, so transport of insoluable large substances. Active= wanting to move, hence moving against the gradient.

For no energy required movement, it is all just different types of diffusion. Simple diffusion = diffusion without intervention. facilitated diffusion= diffusion with help i.e. Through channel proteins or carrier proteins.
Osmosis is just diffusion of water through a semi permeable membrane btw.
Hope that helps. This is just a quick summary not an A+ definition of all thr terms

[melons]

To add to that - think of the concentration gradient as a diagonal line (like a hill). So at the bottom of the hill there isn't much of the substance at the top there's a lot. So it's easy for the substance to roll down the hill - does not require energy (osmosis (water), diffusion and facilitated diffusion). Going up the hill is a lot harder and requires energy (active transport).