The functions of the blood in the body and how the heart works

What are the functions of blood in the body?

The blood is responsible for carrying oxygen to all the cells of the body. So oxygen is the fuel that all tissues need to live.

The blood is filled with oxygen in the lungs, passes through the heart and from there it is propelled to all the tissues (the whole body), once the body takes all the oxygen from the blood, that blood that is without oxygen returns to the heart , from where it is pushed back to the lungs, so that it is refilled with oxygen, returns to the heart and is expelled again throughout the body.

So the heart plays a very important role in the body and its function is closely related to the lungs and some alteration in its shape or structure leads to this blood pumping cycle not being fulfilled in an ideal way.

How does a normal heart work?

The normal heart has 4 chambers: two atria at the top and two ventricles at the bottom (see figure 1). The two atria are separated from each other by the interatrial septum, and the two ventricles are separated by the interventricular septum.

Blood passes from the right atrium to the right ventricle across the tricuspid valve, and from the left atrium to the left ventricle across the mitral valve.

The mechanism of blood distribution in the body by the heart:

The right side of the heart (right atrium and right ventricle) receives blood from all over the body through the superior vena cava (SVC) and inferior vena cava (IVC) and sends it through the pulmonary artery (PA) to the lungs, where the blood (more specifically the red blood cells) take the oxygen, to then return to the left side of the heart (left atrium and left ventricle) through the pulmonary veins (VPI) and from there it is sent through the aorta artery (AO ) to the whole body.