Question

explain how gas exchange occurs in flatworms

Answer 1

Answer:

Gas exchange by direct diffusion across surface membranes is efficient for organisms less than 1 mm in diameter. ... Their cells are kept moist so that gases diffuse quickly via direct diffusion. Flatworms are small, literally flat worms, which 'breathe' through diffusion across the outer membrane.

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Answer 2

Answer:

Direct diffusion is the process which helps in the respiration of flatworms.

Explanation:

Platyhelminthes (flatworms) change gases simply by diffusion through their body surface. This is only possible because all cells are localized fairly near to the surface since gases diffuse cell by cell, the flat shape of these worms is a feature that allows this type of respiration.

Diffusion is the process which helps in the respiration of flatworms where the gases oxygen and carbon dioxide exchange along the cells of the flatworm's body as they have large surface area.

Direct Diffusion

• For small multicellular organisms, direct diffusion across the external membrane is sufficient to meet their oxygen requirements. 
• Gas exchange by the process of direct diffusion across the surface membranes is effective for organisms that are smaller than 1 mm in diameter. 
• In simple organisms like cnidarians and flatworms, every cell in the body is very close to the external surface. 
• So, their cells are kept wet, and gases diffuse easily via direct diffusion. 
• Flatworms are small creatures that “breathe” through direct diffusion across the external membrane. 
• The flat shape of these organisms usually increases their surface area, which helps in diffusion, ensuring that each cell within the body is close to the external membrane surface and has access to oxygen.
• However, also the cells that lie in the centre would not be suitable to get oxygen if the flatworm had a spherical body. 

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