Mass Transport- Veins (BV) Flashcards
1
Q
What valves are present in veins?
A
Semi lunar valves
2
Q
What is in the middle layer of a vein?
A
It has less elastic and muscle fibres compared to arteries
3
Q
What does a vein consist of and how does it compare to an artery?
A
1) Wider lumen than an artery
2) Lower amount of Endothelium
3) Thinner middle coat
4) Thinner outer layer- with a lower amount of collagen
4
Q
what do muscle contractions allow in the veins to do?
A
Temporarily increases pressure which pushes blood back up to the heart
5
Q
What does the respiratory pump allow?
A
When breathing in the pressure in the thorax is reduced.
