The Cardiovascular System: An Overview
The term "cardiovascular system" summarizes certain areas of the human organism. The main task of the cardiovascular system is to supply the body, i.e. organs and all tissue layers, with oxygen and at the same time to remove harmful substances. While the terminology has taken root, it serves only to summarize the two circulatory systems: the small and the large. The two intertwine.
Lesser circulatory system: The pulmonary circulation
The right side of the heart plays a major role in this circulation. It pumps deoxygenated blood into the lungs via the pulmonary circulation so that it can be oxygenated:
- Oxygen-depleted blood: it is pumped out of the body via the pulmonary circulation toward the right atrium of the heart. There it collects until it is pumped into the right ventricle.
- Pulmonary artery: The blood now reaches the lungs via the pulmonary artery. There it is cleansed of carbon dioxide and enriched with new oxygen. Via the pulmonary vein, the fresh blood is brought to the left atrium of the heart.
- Important factors: The two heart valves play a very important role in this circulation. The first is the tricuspid valve. It separates the right atrium from the ventricle. If the blood flows to the lungs, it must pass through the pulmonary valve.
Great circulation: The systemic circulation
This component of the cardiovascular system automatically connects to, complements, and ultimately ends up back in the pulmonary circulation:
- Oxygenated blood: blood previously collected and oxygenated in the left atrium is directed into the left ventricle.
- Aorta: The pumping action of the heart forces the blood into the aorta. The aorta now transports the blood throughout the body, supplying organs and tissues with fresh, oxygen-rich blood. At the same time, the organs release carbon dioxide and other waste products into the blood so that it can later be purified again. The return flow to the right atrium is through the veins of the body.
- Important factors: The individual chambers are also separated from each other in the left side of the heart. The mitral valve separates the atrium from the ventricle, while the aortic valve prevents blood from unintentionally entering the aorta.
This explanation already shows the importance of the whole system and all its components:
- Heart
- Veins
- Arteries
- Lungs
Diseases or weak points in the system automatically weaken the entire apparatus. This is understandable, because if, for example, the heart does not pump sufficiently, neither oxygen-rich blood can be pumped into the organism nor oxygen-poor blood can be processed in the lungs.
Minor weaknesses can result in venous disorders and swollen feet, for example. More serious, however, are clogged arteries, veins or direct weaknesses in the heart.
Fortunately, the cardiovascular system is very stable by nature. In direct comparison, it is less likely to get out of step than the digestive system, for example. Nevertheless, hereditary predispositions, lifestyle or congenital conditions can contribute to a weakening that eventually leads to serious symptoms and disease.