The human body is a well-coordinated system in which the work of each organ is important. Some of them are responsible for defensive reactions, others for human movements, others for reproductive function, etc. But the most important are the heart and brain.
The role of the heart for the body
The heart is the most important human organ because it provides blood flow. The bloodstream carries nutrients and oxygen to every organ and tissue cell. For any system to function, cells need nutrients, their delivery and blood carries them. Also, with the blood flow from the cells, the outflow of carbon dioxide and toxic decay products is carried out.
The heart has two atria and two ventricles. From the left ventricle, the aorta departs, through which oxygen-enriched blood, thanks to heart contractions, flows to all cells of the body. The arteries branch to the smallest capillaries, in which the exchange of nutrients for the products of cell activity takes place, the capillaries collect into the veins and through the vena cava blood enters the right atrium. From the right ventricle, venous blood through the pulmonary artery enters the lungs, where it is saturated with oxygen and enters the left atrium through the pulmonary vein.
When the heart stops, blood flow stops, and the cells of the body do not receive oxygen, due to which oxidation and metabolism occurs, as a result, cell death occurs. Cells of various tissues are differently sensitive to oxygen starvation, the nervous tissue needs oxygen most acutely, without it, neuronal death is noted within 7-10 minutes.
The uniqueness of the heart muscle is that it is equipped with its own autonomous apparatus, in which impulses are generated that provide a rhythmic contraction of the heart. Thus, an impulse from the brain is not required for the myocardium to work, the heart beats even with paresis of the whole body.
central nervous system
The brain and back are also important human organs. With the help of the central nervous system, all processes occurring in the body are regulated. The spinal cord is responsible for the innate reflexes, with the help of which the newborn is fed, the bowels and bladder are emptied, etc. The brain is responsible for the acquired skills: from the elementary ability to hold a spoon in your hands, to complex thought processes.
The brain can be called the main organ, because a person thinks and is aware of himself, thanks to him. The processes of memory, thinking, perception take place in the brain. This organ also analyzes all the information received from the receptors of the skin, muscles, etc., then sends back impulses that provide a response to any irritation. The central nervous system provides the instinct for self-preservation, humoral regulation and other vital processes.