Importance Of Blood (Essay Sample)


In a physiological sense, blood is one of the most important components of our body. The blood is composed of several smaller components, making it vital for nourishing tissues, organs, and systems of the body. The reason behind is that the blood is manipulated by a moving liquid all over the arteries and veins. Our body needs blood because it is where each working organ relies on the oxygen synthesis in order to function properly. While the heart pumps the blood, the products travel across the body in order to release oxygen to every tissue. Without blood in our body, the longevity of life is absent because there are no products that sustain life.

The importance of blood is to nourish each tissue or organs across the body. This happens when the oxygenated red blood cells start to release oxygen to the organs while it passes through them. Oxygenated blood products pass across the arteries, which influences the red color of the blood vessel because it is filled with oxygen. The red blood cells collect carbon dioxide molecules from the organs and then will pass through the veins, which are vessels that appear violet due to the absence of oxygen and the presence of carbon dioxide. After the process, the red blood cells then release the carbon dioxide molecules when they reach the alveoli of the lungs. The red blood cells have at least a 90-day survival rate. They are made by the bone marrow that produces a mature red blood cell each day. If they are no longer viable, they are transported to the spleen and then secreted directly to the kidneys for disposal.

Blood is also composed of white blood cells. These are types of blood cells that are responsible for protecting our body from any form of infection. This is because the white blood cells search for pathogenic microorganisms. They swallow each causative agent wholly, making it an effective defense against infection. Examples are bacteria, virus, fungi, and cancer cells. The white blood cells pass either the circulatory system or the lymphatic system. The lymphatic system is where all the defenders of the body are found. Whenever there are invasive microorganisms that enter the blood stream, white blood cells transports them to the lymphatic system and then exterminated. For the healing process, the platelets are blood products responsible for healing all injured parts of the body. The platelets allow all wounds to be closed to prevent any leakage of blood products into the outside environment.

Every human is compatible with plant species because it creates a symbiotic relationship. The oxygen excreted by the plants is badly needed by every human being. This is because each oxygen molecule is carried by the red blood cell to nourish other cells, organs, and tissues. If humans are exposed to an area where there is a scarcity of an oxygen supply, the chances of survival are slim. When a person encounters an injury, blood loss is inevitable because there is an opening occurred to a certain part of the body, allowing the blood to escape. Losing a large amount of blood could risk a person’s life, which is why our society established a blood bank so that there is a screened blood that is always available whenever a person needs it to prolong their life (Elert, 2012).


  • Elert, Glenn (2012). “Volume of Blood in a Human”. The Physics Factbook. His students. Archived from the original
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