Topic 44 - Veins

Question 1

What is the job of a vein?

Answer 1

To carry blood from capillary networ back to the heart

Question 2

What can be said about diameter and thickness?

Answer 2

Increases towards heart

Question 3

What can be said compared to arteries?

Answer 3

Larger lumen and thinner wall

Question 4

What is different about their walls compared to arteries?

Answer 4

-In their wall there is less elastic elements, smooth muscle and increased connective tissue (collagen).

Question 5

Veins function as?

Answer 5

Reservoir vessels

Question 6

Classification of veins:

Answer 6

Venules: small veins
Large veins
Venous valves

Question 7

Venules, small veins

Answer 7

 Tunica intima: endothelium and lamina basalis
 Tunica media: circular smooth muscle
 Tunica adventitia: longitudinal collagen bundles

Question 8

Large veins:

Answer 8

 Tunica intima: endothelium and subendothelial CT
 Tunica media: circular smooth muscle (may be missing)
 Tunica adventitia: thickest layer. Elongated collagen fibres, elastic elements, smooth muscle, vasa vasorum.

Question 9

Venous valves:

Answer 9

tunica intima duplications and form semilunar pocket-like structures, which prevents backflow.