have a heart
This heart is divided into basically two halves. They are the right side, which brings in and sends out unoxygenated blood, and the left side, which receives and pushes out the oxygenated blood. Not included in this is the coronary valve, which runs through the heart's center and supplies it with oxygen.
"the big one"
The largest artery in the body is the aorta. On average, the adult human aorta can reach two centimeters in diameter. It pumps blood from the heart's left ventricle out through the body's capillaries. The red blood cells squeeze through these tiny veins and release oxygen.
superheroes
Arteries--- AWAY!!! Arteries are pipes in your body that transport blood. There is one major difference between arteries and veins. They both transport blood, but the arteries always carry it away from your heart. Veins push blood back in to your heart. There is one major exception to the rule. The coronary arteries, tiny arteries that supply oxygen to the heart, carry blood in the same direction as veins. They power the heart with air to keep it pumping blood everywhere else.
the midgets
The smallest artery in the human body is called the arteriole. It has a diameter of about 3/10 of a centimeter. In comparison, the 2-centimeter aorta is about six and a half times that size. The veins have a comparably small family member, called the venule.
the brawn
Arteries and veins are often thought of as very similar, but they actually operate very differently. Arteries receive oxygenated blood from the aorta and pump it everywhere in the body. For this reason, arteries pump much harder than veins do.
how are things on the inside?
Ask the average person to picture a human heart. The most common image is something like this...
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But that's not how things really are. The real heart is a relatively small, but constantly working, organ located in the left half of your chest. It is about the size of your fist and looks more like this.
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heart and soul food
The circulatory system collaborates very closely with the digestive system. The digestive system works at breaking down and producing nutrients from food. It sends the food through the small and large intestines, during which time the nutrients and extra water enter the circulatory system. These nutrients are then distributed through the body.