Diffusion spreads the blood cells and any other cells around in the body and gets enough to each organ so your body doesn't fail.
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 :)
they improved oxygenation of tissues
The Circulatory System pumps blood and the Respiratory and Digestive System carry it though your body.
Both have a high surface area for exchange: In the respiratory system the exchange of oxygen an carbon dioxide takes place between the alveoli and blood capillaries (both provide a high surface area for exchange) and in the digestive system, exchange of nutrients and waste takes place between the villi and blood capillaries (also both provide a high surface area for exchange) In both systems, transported materials pass through the membranes by a process called diffusion.
Vascular system, also called the circulatory system. Look those terms up on wikipedia for more info.The answer to this is the circulatory system.The ciculatory system because the heart is in the ciculatory system and the blood is the most important thing in the circulatory system.Circulatory System
the circulatory system can be affected by something happening to something important in it such as the heart.that is one of the most important things in the circulatory system.
If we were small enough we could absorb all our oxygen and nutrients by diffusion. But because we're as big as we are it would take too long for substances to diffuse to everywhere they need to go. So we have to have a more efficient means of getting oxygen and nutrients to where they're needed and that is the circulatory system.
diffusion is important to living system in a way that in can help in reproduction of living system
No lung . . no respiratory system.
The circulatory system is important because it moves blood through all parts of the body. It carries oxygen and nutrients to all parts of the body and removes carbon dioxide and other waste materials.
Diffusion takes away carbon dioxide and unwanted waste from the cells.
The importance of the cardiovascular and respiratory systems working and functioning together correctly is to keep you alive. Respiratory takes in oxygen and expels CO2 Cardiovascular transports both around your body