What is Concentration Gradient? A concentration gradient is the difference in the amount or concentration of something between two points or locations. In simple words, it means that there is more of something in one place compared to another place. For example, if you put some sugar in a glass of water and don’t stir … Read more
Active transport is a cellular process in which molecules or ions are moved across a biological membrane against their concentration gradient, from an area of lower concentration to an area of higher concentration. This movement requires the expenditure of cellular energy, typically in form of adenosine triphosphate (ATP).
What is Facilitated Diffusion? Facilitated diffusion is a type of Diffusion that is based on the movement of molecules from the region of high concentration to the region with low concentration by using specific carrier proteins or channel proteins. Just like simple diffusion, It also happens because of a concentration gradient. It requires no additional … Read more
Due to the distance most cells face from oxygen sources, the slowness of diffusion, and the different needs of different cell types, simple diffusion in insufficient to meet the oxygen requirement of multicellular organisms like humans. But Diffusion is sufficient for unicellular organisms, Read Why? Why Is Diffusion Insufficient For Multicellular Organisms like Humans? There are … Read more
The small size, simple needs, and lack of internal barriers make simple diffusion sufficient for unicellular organisms, but multicellular organisms require more complex transport modes. Simple Diffusion in Unicellular Organisms Unicellular organisms depends on simple diffusion for several reasons: 1: Size Advantage They are small and have a large surface area-to-volume ratio. This means their … Read more
Simple diffusion is considered a physical change because it simply redistributes particles randomly without changing their chemical properties. This spontaneous particle dispersal relies only on intrinsic particle motion and concentration gradients, not the formation or destruction of chemical bonds. Refrences: [1] [2] While chemical changes involve old chemical bonds being broken and new ones formed, … Read more
What is Simple Diffusion? Simple diffusion is a form of diffusion that does not require the help of membrane proteins. In simple diffusion, particles or substances move from areas of higher concentration to areas of lower concentration, going “downhill” due to concentration gradient. It does not involve membrane proteins to help transport the substances across … Read more
