Veins and arteries Flashcards
(9 cards)
1
Q
What is in the inner layer?
A
Lumen
2
Q
What is in the outer layer?
A
Endothelium - collagen
3
Q
What is in the middle layer?
A
Smooth muscle and elastic fibres
4
Q
What do elastic fibres do?
A
Stretch and recoil to maintain BP
5
Q
What are capillaries made of and why?
A
1 cell thick of endothelium for rapid diffusion
6
Q
Why do arteries have more smooth muscle and elastic fibre?
A
To withstand higher blood pressure
7
Q
Define collagen
A
Tough fibrous protein which makes them strong and durable
8
Q
What does smooth muscle cells do?
A
Allows walls to constrict and dilate
9
Q
What are coronary arteries?
A
Supply the heart muscles with blood
