The heart is the main organ of man. It is this pump that pumps blood into the vessels. As long as the heart beats, the person lives. But once he stops doing his important work, life also stops.
Pump principle
Modern studies have shown that each ofstriated muscle fibers - this is a kind of "peripheral heart." And their cuts stimulate blood flow. It is for this reason that physical activity makes the work of the heart much easier, but because of physical inactivity, it must, on the contrary, work in an enhanced mode. By the way, this is one of the most common factors affecting its main functions. As is known, blood enters the capillaries (where there is very low pressure) from the aorta (there, on the contrary, high). How do you keep balance? The heart is a whole system, and one can say it is perfect. Everything is thought out by nature, and this very balance is preserved due to the fact that the blood, entering the capillaries from the aorta, passes through the vessels, and the pressure in them just decreases. Then it enters the venules, and through them into the veins.
Heart cycle
Сердце – это орган, который выполняет огромную work It is a combination of various biochemical, mechanical, and even electrical processes. All this happens during only one cycle of relaxation and contraction, and after all, countless numbers of them are performed per day. Scientists have calculated that in 24 hours a person’s heart is resting for 16 hours, and 8 is shrinking. It should be noted attention to another interesting statistics. Few people know that with age the number of contractions that are made by the heart decreases. That is, the frequency decreases. The heart of a person whose age exceeds 60 years is reduced 80 times per minute. But 125 beats / min is an indicator of a one-year-old child. For all our life, our main engine is reduced by about 3 100 000 000 - it is worth only thinking about how big this figure is! And finally, another amazing fact. The heart is the organ through which about 250 million liters of blood pass through our entire life! It does a really great job. So you need to monitor your health, and even more so - for the heart, regularly supplying it with vitamins and beneficial substances.
Heart nervous system
The human body is one continuous nerve.And in their heart is countless. Despite the fact that the innervation to this organ comes from the sympathetic trunk, as well as from the vagus nerve, all this has only a regulating effect. Excitation occurs in a downward direction from the node located in the interatrial septum. Then this signal is transmitted to the so-called atrioventricular node (it is the border of the ventricles and atria). And the final “point” is the ventricles. The signal extends to all of its muscles.
What does the heart look like?
Настоящее сердце, фото которого не имеет ничего in common with the image that occurs in the representation of each person when it is mentioned, it looks like a cone-shaped organ with adjacent arteries and venous trunks. Explained in words, it resembles a slightly flattened egg with a slightly tapering edge and a system of large vessels on top. If we talk about shapes and sizes, then it should be noted that they are different for each person. It depends on the physique, gender, age and health. The heart is located almost in the middle of the chest, but closer to the left side. It all depends on the individual characteristics of the human body: for some it is more pronounced, for others it is not very. There are cases of pathology, when the heart is on the right side. However, this is a mirror arrangement of organs, and people with such features are quite rare.
Body structure
So, what is the heart, clear, and how it looks- also. But this is still far from all the information you should know about this body. One must also be aware of what it consists of. So, the heart is a hollow organ, but it has as many as four cavities that perform pumping functions. Two atria and two ventricles - these are its main components. The second of these are the most massive. Heartbeats are created precisely by their muscle mass, or to be more precise, with the help of the left ventricle. By the way, they are connected to the atria with special openings fitted with valves. What is the role of the second component? Auricles differ in less developed muscular wall, but they too are reduced. For example, venous blood flows to the right, and arterial blood flows to the left. If we understand the question of what the heart is, then we can say with confidence only one thing: all the vessels, veins, arteries and valves are connected to each other, and together they form a unique organ, thanks to which a person can exist.
Heart diseases
Unfortunately, the heart is not eternalengine. This body is continuously working from the moment of the birth of man into the world and until his last breath on Earth. Earlier it was said about how much work he performs. Some people do not attach importance to this and overload their heart. Others completely forget about its existence and cease to monitor their health. Not surprisingly, heart disease is considered the most common today. They are subject to a huge number of people. And moreover, the symptoms are the most harmless, at first glance, signs. Sweating, for example. Or swelling. If a person suffers from heart failure, then fluid is retained in the body. Because of this, swelling occurs. A sharp increase in weight or, conversely, a decrease in weight may also indicate heart problems. Shortness of breath is another symptom. Of course, it is also observed in lung diseases (COPD or asthma), however, it is also characterized by heart failure. Chest pains spreading to the stomach, neck, jaw, hands, or other parts of the body - this is also a reason to worry. Do not be afraid to go to the doctor. With a heart, jokes are bad, because to delay the diagnosis and treatment is highly undesirable. Otherwise, then it may be too late.
