THE CIRCULATORY SYSTEM

Circulation:
· The circulatory system transport nutrients and oxygen trough the blood to the cells.
Type of blood:
*Plasma: This is the fluid which your blood cells float in. It also carries the nutrients and waste products.
*If you observe a microscope, you will see different type of blood cells.
Type of blood cells:
*Red blood cells: Transport oxygen and carbon dioxide.
*Platelets:They healwounds and stop you bleeding
*White blood cells: They defend your body from virus.
Blood vessels:
*Veins: These are the vessels wich carry blood to your heart.
*Capillaries:Are narrowvessels that connect arteries and veins.
*Arteries: These are vessels wich carry blood away from your heart.

 How your blood moves around your body:
 ·Blood circulation is the journey that your blood takes around your body. This journey is divided into two circuits or routes.
 *Pulmonary circulation: A route that go from the heart to the lungs, and back again.
 *General circulation: A route that go around the body.




The heart.
· The heart is muscular organ with four chambers: two of them are atria and the other two ventricles. They comunicate trough valves. The heart contract and expand to push the blood around body.
*Systole: The heart contracts and sends blood to the arteries.
*Diastole: The heart relax and blood enters from the veins.
 The relations of circulatory system.
 *The respiratory system passes the oxygen it takes to the blood.
*The digestive system transform the food into nutrients and passes to the blood.
*The excretory system eliminates waste substances and produce urine and sweat.