Human Circulatory System

Human Circulatory System

In this article, we're going to be discussing the blood vessels, the arteries, and the veins. We're going to learn about the differences between the arteries and the veins, the blood circulation through heart, lungs and complete system of circulation in humans.

The two kinds of circulatory systems in the body are the systemic circulation and the pulmonary circulation. 

The systemic circulation is taking blood from the aorta pumped out by the left ventricle to all the systems of the body so it goes to the brain, the spinal cord, the kidneys, the liver, the hands and the feet.

It goes everywhere except the lungs so the systemic circulation is perfusing all the systems of the body but the pulmonary circulation from the right ventricle the blood is leaving the pulmonary artery and is going to the lungs only to be oxygenated.

An artery is simply any vessel that carries blood away from the heart it is that simple so an arterial vessel is carrying blood away from the heart. 

The vein carries blood towards the heart, or we can say that veins bringing blood back towards the heart.

Arteries do not have valves to ensure one-way flow but veins do have valves now the reason for this is that the blood goes through the tube of the artery under the influence of the blood pressure generated by the contraction of the heart. In the case of the systemic circulation, the pressure generated by the left ventricle and in the case of the pulmonary circulation, the pressure generated by the right ventricle but the veins don't have this excess because they're carrying blood back towards the heart.

That means the blood only travels in that direction from the periphery back towards the heart and for this reason the veins will have valves.

Once the blood has gone from a lower part of the vein up into the next part of the vein then it shouldn't be able to repeat backward because these valves will shut.

Human Heart

Our heart is similar to a pump, it is a muscular organ about the size of our fist and is located slightly left of the center in our chest.

Our heart is divided into two partitions: the right and the left. 

The partition protects oxygen-rich blood from mixing with oxygen-poor blood together. The heart and blood vessels establish the cardiovascular system which circulates oxygen and blood throughout the entire body. 

For more information watch complete video tutorial ↥↥↥

In a single minute, our heart pumps approximately five quarts of blood. It beats around 100,000 times in a day ie. nearly 35 million times in 1 year.

Oxygen poor blood (Blue in color) returns to the heart after circulating throughout the body. 

The right side of the heart composed of the right atrium and ventricle that collects and pumps the blood to the lungs through the pulmonary arteries. The lungs refresh the blood with a new supply of oxygen making it turn oxygen-rich blood (red in color). The oxygen-rich blood then enters the left side of the heart composed of the left atrium and ventricle and is pumped through the aorta to the whole body. The tricuspid mitral pulmonary and aortic valves work like gates within the heart keep our blood moving the right way. 

These valves open only in one direction when pushed. Each valve opens and closes every second makes one heartbeat. In this way the heart contracts and relaxes. Contraction of the heart known as systole and relaxing of the heart known as diastole. Our ventricles contract and forcing blood into the vessels going to your lungs and body during systole.

The right ventricle contracts a little bit before the left ventricle does your ventricles then relaxes during diastole and are filled with blood coming from the upper chambers - the left and right atria. Then the cycle starts over again. 

Our heart is nourished by blood to blood vessels called coronary arteries extend over the surface of your heart and branch into smaller capillaries.

Here in the picture, you can see the network of blood vessels that nourish our heart with oxygen-rich blood.

 Our heart also has electrical wiring which keeps it beating electrical impulses begin high in the right atrium and travel through specialized pathways to the ventricles delivering the signal to pump the conduction system and keeps our heart beating in a coordinated and normal rhythm which in turn keeps blood circulating the continuous exchange of oxygen-rich blood with oxygen-poor blood. 


(All content and images are for educational purpose).
Thanks...