Why diffusion is insufficient to meet the O2 requirement in multicellular organisms like us?

Question

Answer

IN  large MULTICELLULAR organisms like HUMANS, the OXYGEN of will have to travel large distances inside the human body to reach each and every skills of the body. NOW,since  DIFFUSION is a very, very SLOW PROCESS, it  will take a very long time to make oxygen to all the body cells. Thus ,DIFFUSION is insufficient to meet the oxygen REQUIREMENTS of MULTICELLULAR ORGANISMS like humans because the volume of human body is so big that oxygen  (of air) cannot DIFFUSE into all the internal cells of the human body quickly . So,when the size of MULTICELLULAR ORGANISM is large, then  RESPIRATORY PIGMENT  (such as hemoglobin) present in blood take  up the oxygen from the air in the lungs and carry it quickly to all the body cells................

Answer

Unlike unicellular organisms, in higher multicellular forms including man, every cell of the body is not in direct contact with external environment. only the surface layer cells of skin are exposed to the surrounding environment, so, the exchange of gases by diffusion is not possible in these multicellular organisms.Hope it will work

Answer

The diffusion is not able to meet the requirements of oxygen in multicellular organism because multicellular organism need much more amount of oxygen as compared to unicellular organism if however the process of diffusion is used by human being it takes about 3 year!!! for a molecule of organism to reach our toe from our lungs.
HOPE this helps you.

Answer

Diffusion is insufficient to meet the oxygen requirement in multicellular organisms like us because in multicellular organism cells are not in the direct contact with the outer environment but in unicellular organism there is only one cell which is in direct contact with the outer environment and hence it can you fulfill its requirement by taking oxygen from the outer environment.

Answer

Diffusion Insufficiency in Meeting O2 Requirement in Multicellular Organisms

Limitations of Diffusion
- Diffusion is a passive process that relies on random movement of molecules from an area of high concentration to low concentration.
- It is effective over short distances but becomes inefficient over longer distances in larger organisms.

Surface Area to Volume Ratio
- As multicellular organisms grow, their volume increases more rapidly than their surface area.
- This results in a decreased surface area to volume ratio, making diffusion less effective in meeting the oxygen demands of all cells.

Distance from External Environment
- In multicellular organisms, cells are often located deep within tissues and organs, far from the external environment.
- Oxygen must diffuse through multiple layers of cells and tissues to reach these internal cells, leading to a slower rate of diffusion.

Specialized Respiratory Systems
- To overcome the limitations of diffusion, multicellular organisms have evolved specialized respiratory systems.
- These systems facilitate the efficient transport of oxygen from the external environment to cells throughout the body.

Circulatory System
- In organisms like us, the circulatory system plays a crucial role in transporting oxygen to all cells.
- Blood carries oxygen from the lungs to tissues and removes carbon dioxide, ensuring an adequate supply of oxygen to meet the metabolic needs of multicellular organisms.
In conclusion, while diffusion is essential for gas exchange in organisms, it is insufficient to meet the oxygen requirements of multicellular organisms like us. Specialized respiratory and circulatory systems have evolved to ensure efficient oxygen delivery to all cells in the body.

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