How do the Respiratory system, Digestive system, circulatory system all work together?
The common factor is the delivery of nutrients and prerequisites of metabolism to the different parts of the body and the removal of by products of metabolism out of the body. Without oxygen and food we would die and in the absence of excretion of urea and carbon dioxide we would die from the toxic effects of our own waste. The main way in which the respiratory and the circulatory system work together is that the heart send blood to the lungs, which is then oxygenated, so the blood can then be sent to the rest of the body (after being pumped back through the heart). The digestive system work with the circulatory system by immediatly in the small intestine absorb the nutrients from our food and to put them to use but this is after the nutrients are broken down further by the liver (via the heptic portal) which is the first port of call for nutrients absorbed from the intestine. Also without the heart-beat from the circulatory system, there wouldn’t be any peristalsis which in turn won’t
