arteries, veins and capillaries

Question 1

what direction do arteries carry blood?

Answer 1

away from the body

Question 2

what direction do veins carry blood?

Answer 2

to the heart

Question 3

what type of blood do arteries carry?

Answer 3

generally oxygenated

Question 4

what type of blood do veins carry?

Answer 4

generally deoxygenated

Question 5

structure of veins

Answer 5

• wide lumen for blood to flow easily back to the heart
  -thinner wall than artery - little elastic tissue

Question 6

structure of arteries

Answer 6

• narrow lumen
  -thick wall of muscle and elastic tissues

Question 7

structure of capillaries

Answer 7

• only one cell thick to diffuse molecules against its walls

Question 8

what must arteries be able to do and why?

Answer 8

stretch and recoil because it carries high pressures of blood

Question 9

what do veins contain and why?

Answer 9

valves to prevent blood flowing backwards

Question 10

where do capillaries transport blood?

Answer 10

they carry blood through organs

Question 11

describe the role of arteries, veins and capillaries in the human circulatory system

Answer 11

-arteries carry blood away from the body, all the arteries except the pulmonary artery carry oxygenated blood to the body
-veins carry blood to the heart, all the veins except the pulmonary vein carries deoxygenated blood to the heart
-capillaries exchange materials such as oxygen, glucose and carbon dioxide with body tissues

Question 12

what type of pressure do veins carry blood

Answer 12

under low pressure