blood vessels Flashcards
1
Q
what are the three types of blood vessel?
A
- arteries
- veins
- capillaries
2
Q
which is the smallest blood vessel?
A
capillary
3
Q
what has a thinner wall a vein or an artery?
A
a vein
4
Q
why do veins have very thin walls?
A
so there is a larger area for blood to flow through
5
Q
what is the artery wall mainly made up of?
A
muscle and elastic fibres
6
Q
what are valves useful for in veins?
A
to stop blood flowing the wrong way and to ensure blood is flowing in the right direction
7
Q
how thick is the capillary wall?
A
one cell thick
