<a href="https://en.wikipedia.org/wiki/Template:Heart_diagram" target="_blank" rel="noopener">Source</a>
The human heart is a four chamber pump in our bodies. Here is a drawing of what it looks like as a map. It pumps all our lives and if our heart is in a bad condition then we are in big trouble. Now the Aorta is the largest artery in the human body it takes oxygenated blood throughout our bodies. From head to toe.
The oxygenated blood feeds our tissues and the blood returns to the heart with no oxygen. The deoxygenated blood is feed to the heart through the Vena Cava and is pumped through the lungs through the pulmonary Artery. That returns with oxygenated blood to the heart and this continues as long as we live and breathe..
I find this a fascinating subject as it is like the road works inside a city, traffic comes in and traffic goes out.
If the heart is blocked, there is need for heart surgery to remove the blockage. If a valve leaks, it needs to be repaired surgically. If there is a hole in the heart so that the deoxygenated blood mixes with the oxygenated blood. There is yet more trouble.
Other things can go wrong, if the heart does not pump as it should there is something wrong with the biological pacemaker and many people have an artificial one.
One thing people can do is to avoid blockage of the arteries or veins. By not eating too much fat, salt or sugar. However, in moderation it’s OK. Exercising according to your ability is great for your heart health.
There are all sorts of medicines on the shelf for the heart, only for those with heart problems. The best way is to eat plenty of vegetables and some fruit and go for a walk sometimes.