Human Heart, biology, how human heart works?

How a human heart works? Let’s learn!

The heart has four chambers or lobes called as right auricle/atrium, right ventricle, left auricle/atrium and left ventricle.

We will start from the collection of impure blood or simply called as deoxygenated blood. The deoxygenated blood comes into the right auricle/atrium through superior and inferior vena cava. Superior vena cava collects impure blood from the upper part of the body and inferior vena cava collects impure blood from lower parts of the body. The right atrium receives impure blood from this venae cavae and pumps to the right ventricle.

Now, right ventricle pump this blood to the lung for the oxygenation process through the pulmonary artery (only pulmonary artery carry deoxygenated blood, otherwise the function of arteries to carry oxygenated blood throughout the body), in lungs exchange of gases takes place, oxygen is going to mix in blood and Carbon dioxide is going to be exhaled from the lungs.

Now the oxygenated blood is going to come in the left atrium through pulmonary veins (only pulmonary veins carry oxygenated blood otherwise veins carry deoxygenated blood). Left atrium pumps the oxygenated blood to left ventricle and the left ventricle pumps the blood to the whole body for this purpose left ventricle have three times more stronger muscles than the right ventricle.
The oxygenated blood is carried by the biggest blood vessel called Aorta, which further divides into many branches to carry oxygenated blood to all organs.

Let's learn about the heart's valve and their position (Below figure).
heart diagram
A well-labeled diagram of the human heart (source: Pixabay)

There are four valves present in the heart, which prevent the back-flow of flow to the respective chamber. Let’s discuss this.
The first valve is present between the right atrium and right ventricle called a tricuspid valve, which prevents back-flow from right atrium.
The second valve is present in between the pulmonary artery and the right ventricle, it prevents back-flow from the pulmonary artery to the right ventricle. It is known as a pulmonary valve.
The third valve is present in between the left atrium and left ventricle named bicuspid or mitral valve, it prevents the back-flow of blood from the left ventricle to the left atrium.
The fourth valve is present between the left ventricle and aorta, which is named as aortic valve and prevent back-flow from aorta to the left ventricle.

The heart supplies blood to the whole body who supplies blood to the heart? The answer is coronary arteries.

Coronary arteries are the branches of the aorta that supply blood to the heart and when there is any blockage or they get clogged due to some reason then coronary heart diseases develop. In this condition, the heart does not get enough blood and oxygen and unable to do its function. And we have heard about bypass surgery, so this surgery is done in these coronary blood vessels.

heart coronary artery
Coronary arteries and veins

Image Souce: Pixabay

Keywords: Heart, Human heart, how the human heart works, valves of heart, coronary arteries

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