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What is Diffusion?

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  • Last Updated : 24 May, 2022
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The movement of particles, molecules and atoms from a region of higher concentration to a region of Lower concentration until they get uniform concentration as a result of their movement energy is called diffusion. It is important for the proper functioning of the cell because it maintains the gradient across the cell membrane

Diffusion in Water: When a food colour is added to water. the whole water changes into the colour of food colour due to diffusion

Diffusion in Air: when we spray perfume on one side of the room its fragrance spreads in the whole room 

Diffusion

 

Types of Diffusion

There are classified mainly into two types

  • Simple diffusion– is defined as substances moving through a semi-permeable membrane or a layer or in solution without any aid of transporters. For this type of process, there is some criteria that must be followed i.e. the solute is non-polar and has a low molecular weight then 10000 kDa 
    Example– Nutrition in small bacteria, Movement of Carbon dioxide, water, and oxygen in the cytoplasm
  • Facilitated diffusion– is quite opposite to simple diffusion means the substances are moving through the semi-permeable membrane or a layer from the region of higher concentration to a region of Lower concentration with a carrier. 

    FacilitatedDiffusion

    The facilitated diffusion is further classified into two types there are – 

    • Dialysis is a type of facilitated Diffusion a selective membrane that allows only specified molecules or atoms to pass through it. 
    • Osmosis is another type of facilitated diffusion it allows all types of molecules or atoms with the semi-permeable membrane to pass through it is the process of a solution moving from a semi-permeable membrane to high concentration to lower concentrations
Osmosis

 

Types of osmosis 

  • Endosmosis- It is defined as the movement of solutions into the cell 
  • Exosmosis- It is defined as the movement of solutions out to the cell is called exosmosis

Uses of osmosis 

  • It is used for plants receiving water from the soil- Water Absorption
  • Its use also helps in the preservation of meat and fruits
  • Even used in kidneys dialysis

Factors of osmosis

  • Temperature
  • Pressure
  • Surface area
  • Water potential and 

Cause of osmosis 

The momentum of molecules deficit within the pores due to the reflection of solute molecules by the membrane

Factors effects Diffusion

There are some factors that affect the diffusion It is an individual or uniform rate of diffusion

  • Size of the molecules or atoms and particles
  • The” Temperature” of the place while running diffusion
  •  The viscosity of the concentrations   
  •  Areas of both solvent and gases and interactions

 Significance of diffusion

  • Diffusion is the mandatory process to live each one means humans, plants, and animals. the diffusion takes plays an important role to live humans animals and plants and etc on the earth
  • It is the main role of human life because diffusion is in the respiratory system the oxygen and carbon dioxide is diffusion each other process with the cell membrane into the blood in the body
  • It also plays the main role of plant the water and minerals from the soil in the process of diffusion with the root hair cells 
  • If diffusion is not the perfume and food colour are not complete the duty while our life is totally changed to hard 

We known as the diffusion is a natural process in the nature  if we want to live the diffusion is a compulsory process because of oxygen and carbon dioxide diffusion process with the cell membrane 

Examples of diffusion 

  • The green tea pocket is dipped in the hot water the water changes colour to green due to the process of diffusion 
  • The perfume is sprayed on one side of the room. the perfume atoms are diffusion in the whole room
  • The food colour is added to water and the water is changed to the same food colour cause of diffusion

Examples of facilitated diffusion 

  • It uses to transport proteins to move molecules from higher to lower concentrations with the aid of proteins.
  • Every molecule is not capable to cross the membrane if crosses the membrane the molecules should be a non-polar and small molecule

When the cell membrane wants glucose but glucose is a big molecule so it’s not crossed the cell membrane and sodium-calcium are charged so it’s repelled by a membrane in this situation substances transfer across the membrane certain, integral membrane proteins or transmembrane required it is called as facilitated diffusion

Conceptual Questions

Question 1: What is diffusion?

Answer: 

Diffusion is a process of the molecules or atoms and particles moving from a region of higher concentration to a region of Lower concentration (/along the concentration gradient) until they get a uniform concentration as a result of their movement energy is called diffusion.

Question 2: What is dialysis?

Answer:

Dialysis is a type of facilitated diffusion it is defined as substances are moving a selective membrane that allows only specified molecules to pass through the membrane

Question 3: Importance of Diffusion? 

Answer:

The diffusion is mainly in our lung breathing process the oxygen and carbon dioxide are moving through the cell membrane with the process of diffusion. Diffusion is important for the normal daily process that occurs in a living cell. Need for maintaining the concentration gradient around the cell membrane, in the excretion system to remove waste, for nutrition in the lower organism.

Question 4: Defined the simple diffusion?

Answer: 

Simple diffusion is defined as substances movement through a semi-permeable membrane or a layer  or in a solution without any help from carriers

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