blood vessels

Question 1

carrys blood away from heart

Answer 1

arteries

Question 2

these are involved in exchange of materials at tissues

Answer 2

capillaries

Question 3

these carry blood to heart

Answer 3

veins

Question 4

what are the features of arteries

Answer 4

the heart pumps blood out at high pressure so the artery walls are strong and elastic.
walls are thick compared to size of hole down th middle(lumen)
thick layers of muscle to allow them to stretch

Question 5

what are the features of the capillaries

Answer 5

capillaries are very small.
carry blood close to every cell to exchange substances with them
they have permable walls so substances can diffuse in and out
walls one cells thick

Question 6

what are the features of veins

Answer 6

there is lower pressure so walls dont need to be as thick as artery walls
they have bigger lumen to help blood flow despite the lower pressure
they also have valves to keep blood flowing in correct direction.