Types of Carrier Transport:
There are two different kinds of Carrier-mediated transport:
1. Passive Transport:
It is also referred to as facilitated diffusion. The process of passive transport involves the movement of particles from a greater concentration region to the lower concentration region that does not involve any expenditure of energy. This transport is mediated by the carrier proteins. An example of passive transport is the intake of glucose into the cells.
2. Active Transport:
It is also referred to as the pump mechanism. This process mediates the transport of molecules that requires both a carrier molecule as well as expenditure of energy. The active transport of molecules mediates the movement of particles against a concentration gradient. The energy that is utilized in active transport is derived from ATP.
Steps involved in Carrier Transport System:
There are three steps involved in the carrier-mediated transport of molecules:
1) The substrate of the carrier binds to the carrier at one end of the membrane
2) The confirmation of the carrier undergoes modifications that mediates the transport of the substrate to the other end of the membrane
3) Deposit of the substrate on the other side.
Significance of Carrier Transport:
Most of the cells comprise carrier-mediated transport systems situated on the membranes. Certain carriers mediate the transport of a single molecule from one end to the other whereas certain molecules mediate the co-transportation of molecules that carry the molecules in the same direction (Symport) or opposite direction (Antiport).
Glucose and other sugar molecules, amino acids uptake into the cells is mediated by passive/active carrier-mediated transport. The intestinal mucosa and tubules of the kidney mediate the transport of molecules through the Active carrier transport system. Cells of the liver, RBCs, muscles, etc. mediate the transport of molecules through the Passive carrier transport system.
A unique trait of diffusion is that the diffusion is mainly influenced by random walking of the particle and as a consequence, it renders mixed/mass transport that does not require guided bulk movement.
The transport of molecules through diffusion is often referred to as net movement and net diffusion.
Types of diffusion:
2 different types of diffusion are usually categorized under the passive transport of molecules that do not utilize expenditure of energy.
Diffusion is mostly applied in various concepts of chemistry, biology, physics, etc.
Simple diffusion is the process that involves the movement of particles across a semipermeable membrane or solution that does not require any carrier molecules.
E.g. The transport of nutrients, water, oxygen in the cytoplasm of bacteria is mediated through diffusion.
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