blood Flashcards
1
Q
3 types of blood vessels
A
- arteries
- capillaries
- veins
2
Q
what do arteries do
A
carry blood under pressure
- walls are strong
- contain thick layers of muscle and elastic fibres -stretch
3
Q
what do capillaries do
A
- carry blood close to every cell
- permeable walls-diffusion
- walls are only one cell thick-increases diffusion
4
Q
what do vines do
A
- take blood back to the heart
- valves –right direction
