2.5 the blood

Question 1

what is an artery?

Answer 1

• carries blood away from the heart

Question 2

what is a vein?

Answer 2

• carry blood to the heart

Question 3

what is a capillary?

Answer 3

transport blood to the cell

Question 4

what is the structure of a capillary?

Answer 4

• single cell thick so diffusion of oxygen happens quicker

Question 5

what is the structure of the vein?

Answer 5

• valve open and close to prevent back flow of blood
• larger lumen pumps blood at lower pressure
  -thin wall

Question 6

what is structure of the artery?

Answer 6

• small lumen pump blood at higher pressure and faster
• thick elastic wall

Question 7

what is plasma?

Answer 7

• makes up 55% of blood
• transport dissolved substances around the body, maintains body temperature and ph

Question 8

what are platelets?

Answer 8

• blood clotting

Question 9

what are white blood cells?

Answer 9

• defend body against pathogens

Question 10

what do red blood cells do?

Answer 10

-transport oxygen

Question 11

what are adaptations of red blood cells?

Answer 11

• haemoglobin binds to oxygen
• no nucleus increases surface are and maximise space for haemoglobin
• biconcave disk shape for increase surface area for maximum diffusion