Diffusion

diffusion is a process in which molecule move higher to lower concentration

1. Diffusion Types, Factor and function Mrs. Praveen Garg VITS College, Satna

2. Diffusion Diffusion is the movement of a substance from an area of high concentration to an area of low concentration.  Diffusion   occurs in liquids and gases because their particles move randomly from place to place.  Diffusion  is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space.  Diffusion  is an important process for living things.

3. Example of diffusion The perfume of a flower that quickly permeates the still air of a room. A drop of food coloring diffuses throughout the water in a glass so that, eventually, the entire glass will be colored. Diffusion  is very important in the body for the movement of substances. Such as the movement of oxygen from the air into the blood and carbon dioxide out of the blood into the air in the lungs, or the movement of glucose from the blood to the cells.

4. There are two types of diffusion:  Passive Diffusion. Facilitated  Diffusion. Types of diffusion

5. Passive Diffusion It is also known as simple diffusion. Passive diffusion is a process in which the movement of molecules along their concentration gradient without the direct involvement of any other molecules. It can involve either the spreading of a material through a medium or the transport of a particle across a membrane.  Simple diffusion is relevant in chemical reactions. In most biological systems, diffusion occurs across a semi-permeable membrane made of a lipid bilayer . The membrane has pores and openings to allow the passage of specific molecules.

6. Facilitated  Diffusion. Facilitated diffusion, requires the presence of another molecule (the facilitator) in order for diffusion to occur. Facilitated diffusion is necessary for the movement of large or polar molecules across the hydrophobic lipid bilayer . Facilitated diffusion is necessary for the biochemical processes of every cell since there is communication between various subcellular organelles. As an example, while gases and small molecules like methane or water can diffuse freely across a plasma membrane, larger charged molecules like carbohydrates or nucleic acids need the help of transmembrane proteins forming pores or channels.

7. Factors that Affect Diffusion Temperature: With increase in temperature, the kinetic energy of all particles in the system increases. This increases the rate at which solute and solvent molecules moves. Area of interaction: If the block of dry ice is broken into multiple pieces, the area that interacts with the atmosphere immediately increases. The number of molecules that only collide with other carbon dioxide particles within dry ice decreases. Therefore , the rate of diffusion of the gas into air also increases .

8. Concentration Gradient: When the medium (or solvent) has a very low concentration of the solute, the probability of a molecule diffusing away from the central area is higher.  Particle size: T he diffusion of a smaller particle will be more rapid than that of a larger-sized molecule. This is related to both the mass of the molecule and its surface area. A heavier molecule with a larger surface area will diffuse slowly, while smaller particles will diffuse more quickly. For example, while oxygen gas will diffuse slightly more quickly than carbon dioxide, both of them will move more quickly than iodine gas.

9. Functions of Diffusion Diffusion in the human body is necessary for the absorption of digested nutrients, gas exchange, the propagation of nerve impulses, the movement of hormones and other metabolites towards their target organ and for nearly every event in embryonic development.

10. Thank you