Their cells are too close to the animal's exterior surface.
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.
they are related because they are
There the same because there both systems.
the circulatory system and the respiratory system are the names
Diseases of the circulatory and respiratory systems begin to develop due to disorders of the heart and lungs.
The circulatory and respiratory systems work together to get oxygen to cells. Oxygen transfers from the respiratory to the circulatory system at the capillaries surrounding the alveoli.
Working together, the respiratory and circulatory systems perform gas exchange from the blood to the lungs. This exchange occurs at the alveoli.
1. Respiratory system 2. Cardiovascular 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.
respiratory system Circulatory system
The respiratory system and the circulatory (cardiovascular) system.
Cardiothoracic surgeons work with both the respiratory and circulatory systems. They may also be called chest surgeons.