Flat worms do not have blood. There fore, they do not require a respiratory system to infuse fresh oxygen into the blood. This lack of a respiratory system, means they do not have lungs.
Flatworms do not have a circulatory system because they are thin enough for nutrients and gases to diffuse directly through their bodies. They also lack a respiratory system as they absorb oxygen and release carbon dioxide through their skin.
Their cells are too close to the animal's exterior surface.
Because when mammals breathe (Respiratory) it causes their blood to circulate (Circulatory) ad they need their blood to circulate to live. Hope this was helpful. :)
Well, it depends on the organism an the requirement. If you talk about lower organisms like poriferans they don't have circulatory system, respiratory system neither digestive system, simple diffusion occurs in their body as they do not need such system because of their environment and simplicity of development. If you consider flat worms (platyhelminthes) they have a low digestive system but lack any circulatory system as their cells are enogh close to the environment simple diffusion fulfills the respiratory requirement. The need, importance and significance increases with the complexity of an orgnism. As the man is most complex each system is really important. Without digestive system you can't make food simple,without respiratory system you can't yield energy, without circulatory system you can't supply energy or nutrients to the cells at distances. Hope you've got the answer of the question :)
The circulatory system and respiratory system work together to provide the body's cells with oxygen and to carry away the carbon dioxide that cells generate as respiratory waste. The respiratory system gets air into lungs and in the small air sacs were oxygen is transported into the blood, and the circulatory system carries the oxygen in the red blood cells and delivers it to cells in need of oxygen. The oxygen is stored in the hemoglobin in the blood, and the blood is pumped around the bodily organs by the heart, releasing oxygen at the organs.
Cellular respiration. Cells need oxygen that enters the body through the respiratory system, then the circulatory system does the oxygen and carbon dioxyde exchange to complete cellular respiration. Digestive and circulatory - nourishment Urinary and circulatory - excrements, filtration etc
Always! you need the process of the circulatory system in order to breathe and exhale waste.
you would need a cardiology doctor if the circulatory system fails
Cockroaches do have circulatory systems, they are are open circulatory systems
The respiratory system brings in oxygen from the air, which is used by cells in the process of producing energy in the form of adenosine triphosphate (ATP). The circulatory system then transports this oxygen through the blood to the cells where it can be used in cellular respiration to generate energy.
There is definitely a general need for a circulatory system. This system carries blood, oxygen, and nutrients to all parts of the body.
Without these systems, we wouldn't be able to breathe or to pump blood throughout our body. We need these systems in order to stay alive.