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Yes, it lacks a circulatory system. It diffuses oxygen directly into its cells and diffuses carbon dioxide back out. That mechanism is why planarians need to keep their skin moist. On land, planarians secrete a thin layer of mucus to make diffusion easier.
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What does an open circulatory system lack?
Vessels
How is the body form of a hydra limtied by its lack of a circulatory system?
The purpose of a circulatory system is to distribute nutrients and oxygen to every cell in the body. As hydras lack a circulatory system such distribution must be accomplished by diffusion along, which is a very slow process and inadequate for anything of any size. So the body form of a hydra is limited in size due to a lack of a circulatory system.
In animals that lack a circulatory system how are materials transported?
diffusion
Why do larger animals like a bullfrog require a circulatory system but animals such as a planarian do not?
Diffusion is inadequate to move gases through the surface and into all parts of a larger animal body. However, diffusion alone is sufficient to move gases in and out of the thin body of a planarian.
Do Cnirarians have blood?
No , cnidarians don't have blood .They lack any type of circulatory system .
How are materials transported in an animal that lack a circulatory system?
Cause they like to f**K
How can a persons lifestyle affect the performance of respiratory and circulatory system?
Smoking, lack of exercise, lack of attention to Asthma, and exposure to irritants such as dust can all affect the performance of the respiratory and circulatory systems.
How can a person lifestyle affect the performance of the respiratory and circulatory system?
Smoking, lack of exercise, lack of attention to Asthma, and exposure to irritants such as dust can all affect the performance of the respiratory and circulatory systems.
How can a person lifestyle affects the performance of the respiratory and circulatory system?
Smoking, lack of exercise, lack of attention to Asthma, and exposure to irritants such as dust can all affect the performance of the respiratory and circulatory systems.
How can a persons lifestyle affect the performance of the respiratory and circulatory system?
Smoking, lack of exercise, lack of attention to Asthma, and exposure to irritants such as dust can all affect the performance of the respiratory and circulatory systems.
How can a person's lifestyle affect the performance of the respiratory and circulatory system?
Smoking, lack of exercise, lack of attention to Asthma, and exposure to irritants such as dust can all affect the performance of the respiratory and circulatory systems.
How can person's lifestyle affect the performance of the respiratory and circulatory system?
Smoking, lack of exercise, lack of attention to Asthma, and exposure to irritants such as dust can all affect the performance of the respiratory and circulatory systems.
