STRUCTURE AND FUNCTION OF THE HUMAN HEART
By "F"

The heart is the major component of the circulatory system
Its function is to circulate blood, which is comprised of both blood cells and plasma, throughout the body
Two types of blood vessels are used to circulate blood
Arteries are used to carry oxygen rich blood throughout the body, while veins are used to carry oxygen deficient blood to the heart
The heart is one of the most complex organs in the body
One of its primary jobs is to oxygenate blood for the body
Here is how it works
As stated earlier, veins carry oxygen deficient blood to the heart
The blood flows into the right atrium, then the right ventricle, and then the pulmonary artery pumps blood to the lungs for oxygen
Once the blood is oxygenated, pulmonary veins carry blood back to the heart, where it flows from the left atrium to the left ventricle
The aorta pumps oxygen rich blood throughout the body, then the veins carry oxygen deficient blood back to the heart, where the cycle begins again
Quite literally, the heart is "the heart" of the circulatory system
It is amazing to think that such a seemingly simple organ is so complex