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__Facts:__​ Blood is made up of trillions of cells. There are white blood cells and red blood cells. 55% of blood is made up of a pale yellow liquid called plasma. This liquid carries everything around the body.​ This video describes the parts of the blood and what they do. media type="youtube" key="R-sKZWqsUpw" height="286" width="378"

**How the circulatory system works.** Have you ever wondered what happens when you breathe in? Well, when you breathe in blood gets pumped out of your heart from the two lower chambers of the heart called ventricles to your lungs where the blood picks up the oxygen that you breathed in. Then the blood travels to all parts of your body through tubes called arteries. Then it goes back to your heart and is pumped back to the lungs through veins so that the old oxygen can be breathed out as carbon dioxide. Then the cycle starts all over again.

**The heart** Your heart is a muscle about the size of a clenched fist. It is found to the left of your chest and is made of a cardiac muscle that contracts rhythmically of its own accord. The heart is a pump that sends blood around your body. There are four main chambers in your heart. The left atrium, right atrium, left ventricle and the right ventricle. Together the two atrium's (left and right) are called atria. The atria are the parts of the heart that fill up with the blood and stale oxygen (carbon dioxide) that has just circulated around the body. The ventricle's (left and right) are the part of the heart that pumps the oxygen rich blood all around the body.

The ability of an organ or cell to work properly by changing it's process **e.g. when you are hot your body creates sweat to cool you down.** Homeostasis is when your body is trying to keep all the systems stable and working properly even if there are changes in the weather and environment outside the body. The main part of homeostasis is temperature control. In the example above, gives you a meaning of temperature control. The main organs that help homeostasis are the liver, kidney and the brain. The brain is part of homeostasis because it controls all the systems. The kidneys are responsible for the blood water level. **T****he cardiovascular system is connected to homeostasis** in that the cardiovascular system moves nutrients and waste to and from cells to maintain homeostasis. The circulatory system also helps fight diseases, maintain body temperature and pH levels which all helps maintain homeostasis. Technical words: pH = The concentration of hydrogen levels. A pH value shows the intensity of either acid or alkaline and basic. A pH scale ranges from 1 as acid to 14 as alkaline or basic with 7 in the middle as neutral. media type="youtube" key="H04d3rJCLCE" height="312" width="515"
 * Homeostasis **:


 * Technical terms found in this video **

Pulmonary Artery = tubes leading off the heart Aorta= tubes leading off the heart Valves = like trap doors Tricuspid Valve = different valves around the heart Pulmonic Valve = different valves around the heart Mitral valve = different valves around the heart Aortic valve = different valves around the heart Coronary arteries = tubes around the heart that keeps the heart oxygenated and nourished Left main coronary artery = Arteries Right main coronary artery = Arteries Sinoatrial Node = pace maker