Cardiovascular system for kids

Article about Cardiovascular system written especialy for kids.

Cardiovascular system (also called the cardiovascular system) is a network, the blood to the body's own tissues. With each heartbeat sends blood through our body, carrying oxygen and nutrients into our cells. Every day about 10 liters (5) liters of blood in the body to travel many times through about 60,000 miles (96,560 km), the blood vessels that branch and cross, whereby the cells in our bodies and body parts. Of hard-working heart of our thickest arteries, capillaries so thin that they can only be seen under the microscope, the cardiovascular system, our body's lifeline.

The circulatory system consists of the heart and blood vessels, including arteries, veins and capillaries. Our bodies have two circuits: pulmonary (pronounced: in-trouble-Ner-ee) circulation is a short loop from the heart to the lungs and back again, and system (pronounced Si-stem-ik)-flow (system we normally think of as our circulatory system) sends blood from the heart back to all other parts of our body and back.

The heart is the central point in the cycle. As a hollow, muscular pump, its main function to carry blood through the body. They usually kill 60 to 100 times per minute, but can go much faster when needed. It beats about 100,000 times per day, more than 30 million times a year, and about 2.5 billion times in the 70-year life.

The heart receives messages from the body, which say that if the pump is more or less blood depending on a person 's needs. If we 're asleep, but just enough to calm pump a smaller amount of oxygen our body needs, too. If we 're power, or fear, the heart pumps faster to get more oxygen to our body.

The heart has four chambers that are enclosed by thick, muscular walls. It lies between the lungs and the left half of the ribcage. The lower part of the heart is divided into two chambers, which pump than the right and left ventricle blood from the heart. Wall called the septum divides the chamber.

The upper part of the heart consists of two chambers of the heart, as right and left atria (pronounced: ay-tree uh). Right and left the hall to the blood to the heart. Wall called the interatrial (pronounced: in-tur-ay-tree-ul) bulkhead divides the atria, and they 'from the chamber, the AV (pronounced: ay-tree self-re-oh-trick-out yoo - LUR ) valve.

Two other cardiac valves separate chambers and major blood vessels leading to blood from the heart. These valves are called the pulmonary valve that separates the right ventricle, pulmonary artery leading to the lungs, and aortic valve, which separates the left ventricle from the aorta, \ the body's largest blood vessel.

I hope that this cardiovascular system description will be easy to read for kids!