Question

Does diffusion require energy?

Answer 1

Hint: Diffusion is defined as the migration of a chemical from a high-concentration area to a low-concentration area. Diffusion happens when particles in liquids and gases collide and spread out randomly. Diffusion is the mechanism through which chemicals flow into and out of cells in living things.

Complete answer:
During transport, diffusion does not require any energy. When molecules collide with a biological membrane, there are two modes of transport: active and passive. Molecules must be transported actively, which necessitates the use of energy. Molecules do not require energy to move passively.

The transfer of breathing gases is referred to as diffusion. It functions based on gas concentrations. The partial pressure of gases is what it is. For example, oxygen makes up 20% of the air we breathe. The percentage of oxygen in the blood is 15%. In air, the partial pressure of oxygen is higher than in blood. As a result, oxygen flows through the bloodstream via diffusion.

Simple diffusion can be separated from assisted diffusion when it comes to crossing a membrane because:

A. Simple diffusion does not necessitate the use of energy; however, assisted diffusion necessitates the use of an ATP source.
B. While simple diffusion can only transport material in the direction of a concentration gradient, assisted diffusion can move materials both with and against it.
C. Simple diffusion is found only in prokaryotes, whereas facilitated diffusion is found only in eukaryotes.
D. Simple diffusion is not saturable; facilitated diffusion rates are limited by the number of functional membrane proteins and can be saturated.

Diffusion is defined as the net movement of particles (molecules) from a high to a low concentration area. Once the channels have reached their maximum rate, adding more particles has no effect on the apparent rate of diffusion. The protein channel is said to be saturated when it operates at this low rate.

Several points about assisted diffusion are illustrated in the cartoon. Despite the fact that the particles are more concentrated on one side of the membrane, they can nevertheless flow in both directions. The net movement, however, is from a high particle concentration to a low particle concentration. We see a limit to the rate of diffusion at the point of saturation when the number of particles on one side of the membrane becomes so great that they interfere with diffusion via the protein channel.

Note:-
The concentration of two liquids is equalised via osmosis and diffusion. Diffusion and osmosis are both passive transport processes, meaning they don't need any extra energy to work. Particles travel from a high-concentration location to a low-concentration area in both diffusion and osmosis.