CIRCULATORY SYSTEM

CIRCULATION

The circulatory system transport nutrients and oxygen through to the cells. It also helps them to get rid of waste products.

1.Blood

Blood consists of plasma and blood cells.

·Plasma: is the fluid wich your blood cells float in. It also carries the nutrients and waste products.

·Blood cells: In a drop of blood there´re different types of blood cells:

 1. Red blood cells: 

They transport oxygen and carbon dioxide.











2. Platelets:                                                
They heal wounds and stop you bleeding.                                                






3. White blood cells:

They defend your body from microorganisms and viruses.







2.Blood vessels
Inside your body there are three types of blood vessels.

 
       











 3. The heart        
The hear is a muscular organ with four chambers: two atria and two ventricels. They comunicate through valves. The heart contracts and expands to push blood around the body through beating. Each beat has two phases:
·Systole: The heart contracts and sense blood to the arteries.
·Diastole: the hear relaxes and blood enters from the veins.
       



4. Your blood moves around your body
Blood circulation is te journey that your blood takes around the body. This journey is divided into two routes:
·Pulmonary circulaton: This is the route that your body takes from the hear to the lungs, and back again.
·General circulation: This is the route your blood takes around the rest of your body. 

https://www.youtube.com/watch?v=-s5iCoCaofc