How Does The Circulatory System Work?

Simply stated, the blood circulates because it is pushed by the hearth like a pump. 
Arteries and veins are tubes through which the blood is delivered. 
Blood flows and transports air from the lungs and nutrients from the digestive organs to other parts of the body and takes out carbon dioxide and other unnecessary substances from the tissues.

Blood Vessels

Blood vessels are actually two pipe systems, one of which is large and the other small.
We call them big and small circulation.
Both are connected with the heart, “the pump”, but these two systems are not connected.
Small blood stream leads from the heart to the lungs and back, and a large from the heart goes out to the various parts of the body and back again to the heart.
The three types of blood vessels are called arteries, veins and capillaries. 
Arteries take the blood out of the heart, and veins return it back there. Capillaries are the network of small blood vessels, which connect the arterial and venous circulation.

How the heart works ?

The hearth is comparable to a double floor building.
To the first floor correspond the right and left pre-chambers (left and right atrium), and the ground floors are the right and left ventricles (chambers).
There are "doors", called valves, between the floors on each side (house), but none between the two "houses".
Also, there are exit doors of both ventricles which lead to the arteries and entrance doors leading from the veins in the atriums.
In a healthy heart all the door close perfectly, because the blood, once pushed out of the heart, may not return the same hole.
Valves open and close with each heartbeat.
If we follow the path of blood through the entire body, we can note the following: the blood with oxygen from the lungs comes to the left atrium - " the floor". From there passes into the left ventricle “the ground floor", and then into a large artery called the aorta.
The aorta with its branches drains the blood to all organs and body parts.
Blood passes through the capillaries trough the smallest arteries and veins. From there it flows into larger and larger veins, and from the intestines, spleen and stomach first passes through the liver, and finally, all blood is collected in the right atrium of the heart.
From there, it goes into the right chamber, and then to the arteries leading to the lungs.
There, it releases the carbon dioxide and certain parts of water, and instead takes oxygen. Then it is ready to return to the left pre-chamber and the whole process starts over again.
Interesting facts about the human heart
  • Adult heart is the size of a fist, and weighs about 300 grams, yet it for 24 hours can produce energy sufficient to lift about 70 tons (or one locomotive) to 33 centimeters above the ground!
  • During the day, the heart tightens and relaxes approximately 100,000 times. 
  • The heart of adult men in 24 hours, can pump 16.5 liters of blood.
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