Will the heart still beat after leaving the human body? Three secrets about the heart
The heart starts to beat, heart disease, hypertension, coronary heart disease, arrhythmia physical examination confirmed that the heart will push blood into the body's total length of about 60000 miles of blood vessels for circulation, and why the heart so fast and steady blood flow to all parts of the body? In fact, it depends on a very special group of neurons in the sinoatrial node (SA node) of the right ventricle. Heart disease, hypertension, arrhythmia, physical examination, sinoatrial node neurons can automatically and rhythmically generate electric current, which is transmitted to all parts of the heart according to the order of conduction tissue, which in turn causes the contraction and relaxation of cardiomyocytes, and the heart is actually an electronic signal transmitter. When the human heart beats, an electronic signal is transmitted from the top of the heart to the upper cardiac cavity. Electrical signals from the sinoatrial node guide other parts of the heart. Then the blood in each atrium flows to the ventricle through its own valve.
The average heartbeat of a normal person is about 60 to 100 beats per minute at rest, and at this rate, a person's heart beats an average of 2.5 billion to 3 billion times in his or her lifetime. More interestingly, the beating of the human heart does not begin after the baby is born. the heart begins to beat from the 22nd day of the fetus in the mother's belly, and by the time it is almost four weeks old, it has the effect of blood circulation.
Why can the heart beat all the time?
How on earth does an organ like this accompany us all our lives and never rest to keep beating continuously?
The study of the heart began in ancient Egypt in the 16 th century BC, but it was not until 1615 that William, a royal English physicist. Harvey's research confirmed it for the first time.HeartAndBlood circulationIt does matter.
Heart disease, hypertension, coronary heart disease, arrhythmia physical examination
It is confirmed that the heart pushes blood into the body's blood vessels, which are about 60000 miles long, and the blood circulates so fast that it can circulate around the body in an average of 20 seconds, 180 times a day. Why does the heart send blood to all parts of the body so quickly and steadily? In fact, it depends on a very special group of neurons in the sinoatrial node (SA node) of the right ventricle.
Why they are special, because in general, human nerve cells must be stimulated by external stimuli, and the only exception is the neurons of the sinoatrial node.
Heart disease, hypertension, coronary heart disease, arrhythmia physical examination
The neurons of the sinoatrial node can automatically and rhythmically generate electric current, which is transmitted to all parts of the heart according to the order of conduction tissue, which in turn causes the contraction and relaxation of cardiomyocytes, resulting in the contraction, distortion and relaxation of the heart. and then contract again.
The heart is actually an electronic signal transmitter.
When the human heart beats, it is like an electronic signal transmitter. An electrical signal is transmitted from the top of the heart to the upper chamber, then to the lower chamber, and when it contracts, in the same order, the electrical signal from the sinoatrial node guides the rest of the heart.
Heart disease, hypertension, coronary heart disease, arrhythmia physical examination
When the atrium contracts, the valve sandwiched between the atrium and the ventricle opens, and the blood in each atrium flows to the ventricle through its own valve, and then the electrical signal from the heart is transmitted from the atrium to the ventricle, so when the atrium relaxes, the ventricle contracts, providing power for the blood to flow out of the outlet valve and flow to the whole body.
When the lower chamber and outlet valve are relaxed, the upper chamber and inlet valve will be stimulated by another electronic signal to restart the same mode of operation. It takes only a second or less to complete this heartbeat, depending on how fast your heart rate is.
Heart disease, hypertension, coronary heart disease, arrhythmia physical examination
We often hear of "AF" (persistent arrhythmia), which refers to frequent and rapid currents in one or more regions of the atrium, which pass through the atrioventricular nodal conduction system, stimulating ventricular contraction and producing an irregular heartbeat.
The heart can beat for 40 minutes without the human body.
In addition, the most amazing thing about the heart is that it can beat autonomously for a period of time without the stimulation of other nerves in the body, as long as it is given enough oxygen to the heart, it is said that it can beat for up to 40 minutes without the stimulation of other nerves in the body.
Heart disease, hypertension, coronary heart disease, arrhythmia physical examination
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