Blood & Circulation

Blood & Circulation

1. Red Blood Cells

   • Contain no nucleus (doesn't have a dip in the centre)> more oxygen carried
   • Large surface area compared to volume > oxygen close to surface

2. Platelets

   • Platelets clot the blood after a wound > prevents infection and blood loss
   • People with haemophilia have a faulty gene that codes for the clotting process

3. White Blood Cells

   • Larger than red blood cells, flexible shape to help engulf disease organism
   • Protects against infection by digesting harmful microbes, bacteria digested inside WBC
   • Able to squeeze out of capillaries to defend different tissues
   • Has a dip in the centre and has a nucleus

4. Plasma

   • Contains mostly water, dissolved food, urea, hormones and carbon dioxide
   • Pale yellow fluid carries blood cells, useful and waste substances around the body through blood vessels

5. Arteries = Away

   • Arteries have thick walls because the blood pressure is very high. They also have thick elastic walls

6. veINs = IN

7. Capillaries = Small cells

8. Valves = Open and close to let blood through and to prevent back flow

9. Heart is made out of muscle

10. Capillaries take blood to small cells

11. The heart has a double circulation, meaning blood can be pumped to the lungs and body at the same time

12. Pulmonary Artery > Carries blood from the heart to the lungs

13. Aorta (Artery) > Carries blood from heart to body

14. Pulmonary Vein > Carries blood from lung to heart

15. Vena Cava (Vein) > Carries blood from body to heart