Circulatory+System+-+5th+Period

The circulatory system consists of the heart, blood and blood veins

==== The __// =**Heart** //__ is an amazing organ. The heart beats around possibly 3 BILLION times during a lifetime. It is a muscle about the size of your fist. The heart is located in the center of the chest most likely to be found near the left. It's job is to pump the average human's blood and keep the blood moving throughout the body. The blood is pumped by the heart and travels straight to the blood vessels in the body. ====

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In each heartbeat blood is sent throughout the body carrying oxygen to the cell Each day, 2,000 gallons of blood travel many times through about 60,000 miles of blood vessels that branch and cross, linking the cells of our organs and body parts. Circulary system,arteries,veins and capillaries however we don't have only one system we actually have two systems. one of the most well known ones would be the Pulmonary system which is a short loop from the heart to the lungs and back again, and the systemic circulation however the system is often thought of as our circulatory system sends blood from the heart to all the other parts of our bodies and back again!

These processes are caused by the the commands from the body telling the heart to pump.when a human is sleeping, it pumps just enough to provide for the lower amounts of oxygen needed by our bodies at rest.Usually when exercising the heart has to provide enough oxygen due to the increase of fast-pumping.

The heart has four chambers that are surrounded by muscular walls. It lies between the lungs and to the near left of the middle of the chest cavity. At the bottom of the heart is divided into two chambers called ventricles, which pump blood out of the heart. A wall called the interventricular septum divides the ventricles.

Veins are also important in this process, veins transport blood back to the heart. They're not as strong as most arteries, but they contain valves that prevent blood from flowing backward. Veins have the same three layers that arteries do, but are thinner and less flexible. The two largest veins are the superior and inferior vena cavae. The terms superior and inferior by

Another important part of the system is the capillary .It connects the vein and arteries, it is small however a very vital part of this system, it's also through them that nutrients and oxygen go by

=TOP 5 LIST OF WHY THIS SYSTEM IS IMPORTANT=

1.Without it we would not be able to live

2 .It helps pump blood into the body

3. It helps Oxygen make ATP which is necessary for the body

4. Without it, blood could not reach your brain and other vital organs, and you wouldn't be able to live

5, it helps contain homeostasis which is an equilibrium where all the body works appropriately

=BIBLIOGRAPHY=

Works Cited "Heart and Circulatory System." //KidsHealth - the Web's Most Visited Site about Children's Health//. Web. 12 Dec. 2011. .

Why Is the Circulatory System Important." //The Q&A Wiki//. Web. 12 Dec. 2011. .

"Circulatory System." //Hillendale Elementary School//. Web. 12 Dec. 2011. 