Function: To move and circulate blood.
  Transports material (nutrients and oxygen) to and from cells
  Protection of the body by white blood cells
  Regulation of body temperature
 

Structure:
 Blood-:plasma-liquid of blood 92% water and 8% protien

  Platelets- small cells that help the blood to clot.
   Release fibers to work with protien to create blood clots,
   Which form plugs to help reduce blood loss.

  RBC- red blood cells- most abundant. Hemoglobin, red color.
   transport oxygen. Bright red with O2 and purple without     O2.
   Made in bone marrow.
  WBC- defends against disease.
   Eats parts of dead cells.
 Arteries: large blood vessels that carry oxygenated blood.
  From the heart to the body. Thick and elastic

 
 Veins: Blood vessels that carry deoxygenated blood.
  From the body  to the heart.
 

 Capillaries: Tiny blood vessels that absorb food and oxygen to feed
  RBC and get rid of CO2 and waste.
  Connect arteries to Veins.
 

 Heart: A musclar pump that moves the blood throughout the body.
  Four chambers: atrium-upper chambers
     ventricle- lower chambers
 

   Valves between to keep blood going one direction.
 

 Muscles: Cardium- wall of the heart. 3 layers
 Pericardium- surronds the heart. 2 layers.
 
  The right artium taks blood in from the body, through the inferior
  and superior vena cavaís. It then goes into the right ventricle,    through, the pulmonary artery to the lung. When the blood    enters the heart again it enters the left artium and then through    the bicuspid valve into the left ventricle. The left ventricle pumps   the blood through the aorta to the body for the process to     happen again.