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Oxygen can just diffuse directly into the unicellular organism. The same diffusion occurs in a multicellular organism, but the respiratory system has to get the oxygen close to the target cells in order for the oxygen to diffuse. But if there's only one cell to supply oxygen to, no respiratory system is needed.
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∙ 14y ago
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∙ 13y agoHydras can obtain oxygen just with diffusion from the water through the skin. The larger an organism is, the more difficult it would be for diffusion to supply oxygen alone because of the amount of cells from the skin to the center. Hydras are small enough that oxygen can reach every part of the organism effectively. And because it lives in an aquatic environment, the water provides the "wetness" needed for gas exchange.
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∙ 9y agoPlants need an excretory system only that it is not as complex as the one in animals. The form of excretion that plants use is known as transpiration which is facilitated by the leaves.
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∙ 14y agoPlants take in carbon dioxide and give out oxygen directly through pores in their leaves and other tender parts, so they don't need lungs.
Wiki User
∙ 10y agowhy don,t need specialized respiraion system
Wiki User
∙ 11y agoNo
Anonymous
why do plants not need specialised respiratory system
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What are the plant organs in the respiratory system?
leafs are the respiratory system of the plants
The vital organs of respiratory system?
the principal organs of the respiratory system are the nose, pharynx, larynx, trachea, bronchi, and lungs.
Organs in the respiratory and circulatory system?
The main organs of the respiratory system are the lungs. The main organs of the circulatory system are the heart, blood, and blood vessels.
What are the two large lightweight organs of the respiratory system?
These two organs are the lungs.The lungs are these two organs.
Is your respiratory system an organ?
no, but the different parts of your respiratory system are such as your lungs being organs and part of your respiratory system.
What do the organs do in the respiratory system?
The organs in the respiratory system are responsible for oxygenating the blood and for expelling built up carbon dioxide.
What are the major organs in respiratory system?
The main organs of the respiratory system are the nose, pharynx, trachea, bronchi, and lungs.
What are the 3 organs of the respiratory system?
The respiratory system is the system in your body make of choclate and bricks
Do dolphins have different organs there respiratory system than humans?
no we have the same organs in are respiratory systems
Why is respiratory system called a 'system'?
It is a group of organs.
What are the main organs for the respirtary system and circulatory systems?
The main organs of the respiratory system are the lungs. The main organs of the circulatory system are the heart and blood vessels.
Do you have to have all of the main organs of the respiratory system to live?
No you don't need all the organs in your respiratory system to live you can live with 1 lung.
