Circulatory+System

Gross and Cool Facts

•The body of an adult contains over 60,000 miles of blood vessels! •An adult's heart pumps nearly 4000 gallons of blood each day! •Your heart beats some 30 million times a year! •The average three-year-old has two pints of blood in their body; the average adult at least five times more! •A "heartbeat" is really the sound of the valves in the heart closing as they push blood through its chambers.

[|How the Heart Works]

[|Diagram of the heart]

Things you need to know.....


 * The 3 main parts of the circulatory system is the heart, arteries, and veins.
 * 1) Heart - an organ that is a muscle that pumps blood.
 * It is really a double pump:
 *  - the right side pumps blood to the lungs
 *  - the left side pumps blood to the rest of the body

 2. Arteries - blood vessels that carry the blood away from the heart. The blood is high  in oxygen.  3. Veins - blood vessels that take the blood from the cells back to the heart. This  blood contains less oxygen.
 * The circulatory system transports oxygen to the cells.
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">The circulatory system moves blood throughout the body.
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">The circulatory system aids or helps in removing waste from the body.


 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Platelets

<span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - these tiny cells form blood clots to prevent bleeding

<span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - if you cut yourself, the injured cells send out a chemical signal that causes <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%; line-height: 1.5;">platelets to release chemicals that form a clot


 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">White blood cells (WBC)

<span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - these cells are part of the immune system which defends you from disease <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - imagine you cut yourself and it becomes infected by bacteria <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - WBC are attracted to the infection and start to kill the bacteria <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - the infected area turns red and often produces pus <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;"> - the pus is composed of dead WBC, bacteria and other dead cells

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