Heart - is the main body of the person.It is this pump is injected into the blood vessels.As long as the heart is beating - the person lives.But it is worth it to cease to carry out its important work - life will stop.
pump principle
Modern research has shown that each of the striated muscle fibers - a kind of "peripheral heart".Their reduction to stimulate the promotion of blood.It is for this reason that physical activity makes the heart work much easier, but because of inactivity, it must, on the contrary, to work in emergency mode.By the way, this is one of the most common factors of a violation of his main functions.As is known, the blood enters the capillaries (wherein very low pressure) of the aorta (where, conversely, high).How is it to keep the balance?Heart - a whole system, and we can say it is perfect.Nature everything is thought out, and this is the balance is maintained due to the fact that the blood entering the capillaries of the aorta passes through the blood vessels, and pressure them as time and decreases.Then it enters the venules, and through them in the vein.
cardiac cycle
heart - an organ that does a great job.It is a collection of various biochemical and mechanical and even electrical processes.All this takes place within a single cycle of relaxation and contraction, and after them for countless hours performed.Scientists have calculated that 24 hours in a person's heart 16 hours rest, and 8 - is reduced.It should be noted attention to another interesting statistic.Few people know that with age, the number of cuts that made the heart is reduced.That is, the frequency decreases.The heart of man, whose age exceeds 60 years, reduced to 80 times per minute.But 125 beats / minute - a measure of year-old child.Over a lifetime, our main motor is reduced about 3.1 billion - is only think about how this is a great figure!And finally, one more amazing fact.Heart - is the body through which all our lives for about 250 million liters of blood!It holds really great job.So you need to look after their health, and even more so - for the heart, regularly supplying it with vitamins and minerals.
Cardiac nervous system
human body - is one big nerve.And in their hearts and do countless.Despite the fact that this body receives innervation of sympathetic trunk, as well as the vagus nerve, all this has a regulating effect only.Excitation occurs in the direction from top to bottom node in the interatrial septum.This signal is then passed to the so-called the atrioventricular node (it is the boundary of the atria and the ventricles).And the final "point" - is the ventricles.The signal covers all of his muscles.
What is the heart?
real heart, photo has nothing to do with the image that appears in the presentation of each person at the mention of his looks like a cone-shaped body with adjacent arteries and venous trunks.If to explain in words, it resembles a little priplyuschennoe egg with a slightly sharpened edge down and the system of large vessels above.If we talk about shapes and sizes, here it should be noted that they are different for each person.It depends on the body, sex, age and health.Located near the heart of the middle of the chest, but is closer to the left side.It all depends on the individual characteristics of the human body: for some it is more pronounced, while others - not very.Known and cases of disease in which the heart is located on the right side.However, this arrangement of the mirror, and people with these characteristics are rare.
body structure
So, what is the heart, it is clear, and what it looks like - too.But that's not all the information you need to know about this body.It should also be aware about that, what it consists of.So, the heart - a hollow organ, but there are as many as four cavities, performing the pumping function.Two atria and two ventricles - are the main components of it.The second of these - the most massive.Palpitations are just their muscle mass, or to be more precise, with the help of the left ventricle.By the way, they are connected with the atria special holes provided with a valve.What is the role of the second pillar?The atria are distinguished less developed muscular wall, but it has been decreasing.For example, the right to enter the venous blood and the left - arterial.If the deal on the issue of what is the heart, we can say only one thing: all the vessels, veins, arteries and valves connected to each other, and together they form a unique body, through which a person can exist.
Heart disease
Unfortunately, the heart - this is not a perpetual motion machine.The department continually works with the appearance of human birth and until his last breath on earth.Previously it stated that the amount of work it performs.Some people do not attach any importance to this and overload your heart.Other altogether forget about its existence and cease to look after their health.It is not surprising that heart diseases are the most common today.They are exposed to a huge number of people.And where symptoms are most innocuous at first glance, the signs.Sweating, for example.Or edema.If a person suffers from heart failure, it lingers in the body fluid.Because of this, and there are swelling.Sudden weight gain or, conversely, it may also indicate a decrease in heart problems.Shortness of breath - another symptom.Of course, it is observed in diseases (COPD or asthma), however, and it is characterized by heart failure.Chest pain, apply to the abdomen, neck, jaw, arms, 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 trifled with because delay the diagnosis and treatment is extremely undesirable.Otherwise, then it may be too late.
