Skeletal---> Circulatory
The circulatory system and the skeletal system interact in many ways. First, the bone marrow produces red and white blood cells. In red bone marrow, which is in the middle of the long part of bones, red and white blood cells, along with platelets (another component of blood) are produced. In yellow bone marrow, which is at the end of bones in the small holes of the spongy bone, some white blood cells are produced. The circulatory system pumps those blood cells and platelets to the rest of the body in the blood stream. One of the places the blood to brought to is back to all of the parts of the skeletal system. It seems counterproductive to make components of the blood in one place, send them all over the body, and then bring them back, but this is just an organized way to make sure all of the body's cells receive the nutrients they need. Another way that the circulatory and the skeletal system interact is that blood is sent to the bones to give nutrients like glucose and oxygen and takes away the waste products like carbon dioxide. The parts of the skeletal system, like all cells, need this to happen to survive. Glucose and oxygen are needed molecules to go through cell respiration to make energy. The chemical equation for cell respiration is shown here:

oxygen + glucose --> energy + water + carbon dioxide

Energy is used by the cell to do it's job. Water is sweated out, is exhaled as water vapor, or it comes out of the body in urine. Carbon dioxide is put back into the blood stream and brought to the respiratory system, where it is exhaled out. The circulatory system is a series of roads and highways that carry things to where they need to go- it's as simple as that. The final interaction is that the ribs help protect organs in the circulatory like the heart. The heart is the main organ of the circulatory system. It is very important because it directs different blood types to where they need to go and doesn't let the oxygenated and non-oxygenated blood types mix. If they ever mixed, all of the body's cells would get medium-oxygenated blood, and it wouldn't be enough for them to work with. The heart is strong yet fragile, and it needs protection. The ribs provide this protection.123456789.jpg