Principles of SA:V Surface area and volume are both very important factors in the exchange of materials in organisms The surface area refers to the total area of the organism that is exposed to the...
Investigating Diffusion Investigating diffusion using Visking tubing Visking tubing (sometimes referred to as dialysis tubing) is a non-living partially permeable membrane made from cellulose Pores...
Investigating Diffusion & Osmosis: Plant Tissue Investigating diffusion The permeability of cell membranes can be affected by environmental factors such as chemicals or temperature This can be ...
Endocytosis & Exocytosis The processes of diffusion, osmosis and active transport are responsible for the transport of individual molecules or ions across cell membranes However, the bulk trans...
The Process of Active Transport Active transport is the movement of molecules and ions through a cell membrane from a region of lower concentration to a region of higher concentration using energy ...
The Process of Osmosis All cells are surrounded by a cell membrane which is partially permeable Water can move in and out of cells by osmosis Osmosis is the diffusion of water molecules from a dilu...
Diffusion & Facilitated Diffusion Diffusion is a type of transportation that occurs across the cell membrane It can be defined as: The net movement, as a result of the random motion of its mole...
Cell Signalling Cell signalling is the process by which messages are sent to cells Cell signalling is very important as it allows multicellular organisms to control / coordinate their bodies and re...
Cell Surface Membranes Phospholipids Form the basic structure of the membrane (phospholipid bilayer) The tails form a hydrophobic core comprising the innermost part of both the outer and inner laye...
