The heart is a muscle in our body that acts as a pump and pumps blood through the veins and blood vessels. The number of heart contractions in a person at different ages is not the same. In an adult, the heart beats an average of 72 times per minute, in a one-year-old child - 110 times, and in a newborn 120-140 times. By the way, the heart of the fetus begins to beat after 4 weeks.
11 interesting facts about the heart
- On average, the human heart makes 4, 200 contractions per hour, 100, 800 - per day, 36 million 792 thousand - per year, and about 2.4 billion contractions over the average human life span of 64 years.
- In one contraction, the human heart releases an average of 60 milliliters of blood. This amounts to 420 milliliters per minute, more than 25 liters per hour, 600 liters per day, more than 200 thousand liters per year!
- A trained heart is capable of more powerful contractions, has a large reserve strength, and works much more economically. Its efficiency is higher. It decreases less often, and in the intervals between contractions it rests better and is supplied with blood. An untrained person has a resting heart rate of about 70 beats per minute, while an athlete in a normal state has 42 beats per minute.
- At the moment of the highest tension, the heart rate can reach 200-250 beats per minute. Within a minute, such a heart is capable of sending over 40 liters of blood into the circulatory system.
- Interesting studies were carried out by scientists at one time on Andrei Novikov, a participant in a hundred-kilometer ski race. They calculated that in 6 hours 22 minutes spent on the competition, his heart pumped about 35 thousand liters of blood, that is, enough to fill a railway tank!
- Curiously, the heart weighs less than 500 grams, but it does enough work in 10 minutes to lift a person weighing 65 kilograms to a height of 10 meters!
- The heart supplies blood to all organs except the corneas of the eyes, which is more than 80 trillion cells. Subcutaneous fat makes it difficult for the heart to pump blood through adipose tissue, which is very difficult.
- There are 4 chambers in the human heart, while the cockroach has as many as 13. It was the heart of the cockroach that formed the basis for the creation of a new prototype of an artificial heart for humans.
- It is interesting that a man's heart is one third more in weight and size than a woman's, a man's heart weighs an average of 320 g, and a woman's - 240 g. For that, a woman's heart beats more often than a man's.
- At the beginning of the 19th century, French physician Rene Laennec constantly received complaints from patients who did not like the fact that he put his ear to the bust, listening to the heartbeat. Then the young doctor invented the stethoscope so as not to embarrass his visitors.
- The first successful heart transplant was performed on December 3, 1967 by the South African surgeon Christian Barnard to patient Louis Washansky. The patient lived after the operation for only 18 days.