Even the easiest tasks demand energy. Our energy level is regulated by oxygen transported by blood in our vessels. Muscles gain energy from the constant decomposition and synthesizing of certain compounds. If a muscle is stressed, glycogen it contains will react and release energy that is turned into mechanic work and heat. An important factor in this transformation is your blood oxygen level. The air we breathe contains about 23% of oxygen. In one whole day, our lungs process an astonishing 1700 liters of this priceless element.
Our bodies contain other important agents too, some of them in very large quantities.
- Water (our muscles contain 80% of water)
- Lymph that is contained in the lymphatic system (altogether about 15 liters in our body)
- Blood, which can be considered the most valuable fluid (4-6 liters in an adult body)
In our bodies, blood travels in a closed system formed by our blood vessels and heart. Our blood vessels are tubes and capillaries of various dimensions. Our systemic circulation begins from the left ventricle from which oxygenated blood is guided through the aorta and to our entire organism. From there on it travels down veins until it reaches the right ventricle.
This is the starting point of pulmonary circulation. Blood flows to the lungs and is enriched with a fresh supply of oxygen.
Blood supplies our tissues with necessary nutrients and oxygen, while helping rid our bodies of unnecessary and, often, dangerous metabolites. This is why regular and conscious breathing is so important. It helps us get a lot of valuable oxygen.