when is a human heart start functioning? How its able to work non stop so many years till a human dies?

Answer 1

Because it is the strongest muscle in our body, and our lives depend on it constantly functioning.

Our muscles that control the diaphragm are equally important. We don't squeeze our lungs to breath we pull down with the diaphragm, a layer of muscle that separates the lungs from the lower abdomen. To breathe out the diaphragm relaxes, you can force it to depress more to exhale strongly, but usually the last breath is a relaxation.

Both groups of muscles are controlled by the autonomic system, which runs the automatic processes of our body. When the doctor hits your knee with a hammer and the knee kicks, he or she is testing part of that system. When you sneeze you automatically close your eyes, as a reflex. You can hold them open and not lose your eyeballs, and you can sneeze with your eyes open, but you have to force it.

The heart is actually a series of muscles that push the blood between each of the four chambers of your heart. It uses one beat to push the blood through two chambers, on chamber on each side. So you have a two step heart beat; the “lub” followed by the “dub.”

Your brain also never shuts off; it always has to provide the signals to keep things going, you always feel what is touching your skin, the temperature and things like that. You don’t realize it when you are asleep, but you are always using your mind. The old view of the brain, by the Greeks was that it was a radiator to get rid of high temperatures, as short ago as the 1950s we thought we only used 10% of our brain. Now days we realize that we use almost all of our brain and brain mapping has shown that specific areas control things like speech, hearing, sensation etc. Since the speech centers are on one side of the brain you can have a stroke and lose that side and not be able to form words, but you can still think and try to communicate, but words are beyond you. You will have to retrain your brain to be able to handle that. The brain is pretty flexible and if it survives damage then it can rewire itself. It is not so good at self repair; nerve cells don’t grow back as readily as do blood or skin cells.

The brain is the hungriest organ in the body. You can cut off the blood supply to any limb or your lower abdomen for ten-twenty minutes with no more harm than the “pins and needles” feeling after you restore circulation. What happens is when you let the blood supply back in the oxygen starved tissue is refreshed and wastes are carried away. The starving tissues stop working and feeling so you have a numb limb or foot, until you get the blood back in it.

The brain can go for a maximum of three minutes without a fresh supply of oxygen. Death can come from many sources and means, but it always ends up that the brain takes damage and dies due to oxygen starvation. Only at that point will the body die.

The heart and lungs are important because that is the only way that the brain can get its fresh oxygen supply, yet we know that we can temporarily shut them off or even remove them for transplant and then restart the body again. As long as the brain keeps getting oxygen it is okay.

One problem with your heart is that like a muscle it gets stronger when there is more stress put on it. So if you are a fatter person, you will have more skin and fat tissue; all that tissue has to be supplied by the blood stream so you need to push more blood around. Therefore a common adaptation for fat people is to get an increase in the heart size and an increase in their blood pressure. To prevent this scientists and doctors give us drugs to reduce our blood pressure and try to get us to lose the weight. They have to make the heart pump weaker so that it won’t get too strong. There is only so much space in your rib cage so an enlargened heart can be a problem. But, the biggest problem is that when it gets larger it uses more energy, it works harder, and that shortens the lifespan of the heart. A heart can fail or suffer a heart attack or give the brain a stroke when the pumping begins to fail.

A stroke happens when an area of the brain is starved of oxygen for over that 3 minute limit.
A heart attack is when the heart muscle itself is starved of oxygen. Blood clots are the common reason for this, and a heart bypass operation will get around that blood clot. You can also get a heart attack as the blood supply from the pumping heart just isn’t enough to keep the body running; the heart is too tired and it is failing. In this case the result could be a stroke or physical damage to the heart. If your lungs are damaged then they can still work, even if they have a lot of fluid buildup they can still work, and your body can repair any other part of the body. But, you can’t repair heart tissue. Once you stop growing that is all the brain and heart tissue that you are going to get. Oh sure you can get a little replacement, but not anywhere near enough to repair damage done to it. If the heart is damaged by a heart attack then it can still keep on pumping, but it will be weakened. Additional heart attacks will weaken it even more and that can always lead to a stroke.

Your heart muscles beat for your lifespan because like the brain and lungs they are designed to. The limit one repairing our brains and hearts is one big reason for a limit on our lifespan. We can transplant the heart, but the brain has too many nerve connections to transplant. We are learning how to graft nerve tissue so it will repair itself, but we can’t form new nerves and we are limited in the amount of nerve tissue that our body can repair.

Stem cell research is important because stem cells are cells with no mission in life; they can become heart, brain, lung, leg, stomach, any tissue. They are the only cells that can become new brain, new nerve or new heart tissue. If we can control stem cells then we can grow a new heart for someone who has a failing heart and transplant their new heart into their body. Since it came from stem cells that were matched to the patient the heart tissue won’t be rejected, and if stem cells can be encouraged to grow and repair nerve tissue then the heart can once again be controlled by the brain again. The heart is used to a regular beat, if you have a heart transplant then the heart can be returned to that regular beat, but it is doing that on its own. If you work harder then your brain can make your heart speed up to improve the blood supply. But, if you have a transplanted heart, your brain doesn’t have that kind of control and it can’t speed it up to fit the new needs on your body.

The heart is a truly marvelous organ; its beat literally sets our life. The moment it goes quite is most often 3 minutes before our death. Otherwise it will beat for our entire life. If it is starved, or damaged then it has problems repairing itself, and often it can’t. It could replace blood vessels, but not actually heart muscle. Once heart muscle dies it is gone and the body won’t be able to repair it.

Individual heart cells divide to replace themselves and die off, but this is a normal body function and all of your body is doing that. If you need to repair your leg then the body will accelerate this process to do that. The heart won’t do that, so while it makes normal repairs from normal wear and tear, any unusual damage can’t be repaired.

Answer 2

3rd week from conception! Thumpity thumpity thumpity thump! A recent study has indicated there is a link between the quantity of heart beats and longevity within all animals: a shrew beats at 1000 beats plus-lives 2 or 3 yrs. A whale and an elephant beat every 3 seconds or so and live 60 to 80 years. They both work out to have the same amount of beats over their life then...plunk! The (atheist) researcher reporting this is stunned to discover this total number of beats being consistant throughout the animal kingdom! He sees this as a powerful indicator of there being some intelligent cause behind all these life forms possessing this exact similarity.

Answer 3

Actually, our heart had start functioning since we are in our mom's womb. How it ables to work non-stop for so many years, I can't really tell. From what I know, the heart will work much faster when we are exhausted; as the body needs more oxygen, and they must do their work quickly so that the body wouldn't die. Also, they have some kind of rhythm that makes we have heart pulses..

Answer 4

ur question is really very nice heart is one of the most imp organ in a human body.it start working with the moment a baby is formed in foetus.hearts function is to purify our blood & with dirty blood no one can leave so its function become very important and it work throught ones life . it is able to work continously till ones death by the help of protein,vitamins and other minerals which we intake.....
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Answer 5

You mean like evey other organ and muscle in the human body? Cells are replaced constantly as they wear out.

Don't know exactly when it starts, it's a few weeks after conception.

Answer 6

i think it starts beetin in the 3rd week
and it beets on and on cos of the sinoatrial node that is a mixture of the nervous system and the muscular system.... since it genrates its electrical impulses by itself... or so thought of... scientists have not completely understood it....

the sinoatrial is wat maintains th rhythm and the lub-dub sound because...
1. the impulse first starts from the rigfht side of the heart and causes the ventricles to contract and sound "lub"
2. in the next minute second, it travels to the atria that contract in turn and cause the "dub" sound following the "lub
and on and on...