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In veins thickest tunica is,
Option: 1
Tunica media
Option: 2
Tunica externa
Option: 3
Tunica interna
Option: 4
Both a and b
Answers (1)
As we have learnt:
The differences between arteries and veins are as follows:
| Veins | Arteries |
| Move towards the heart | Move away from the heart |
| Collects blood from the body organs | Distributes blood to the body organs |
| Blood pressure in veins is low | Blood pressure in arteries is high |
| Valves are present | Valves are absent |
| Carry deoxygenated blood except for pulmonary vein | Carry oxygenated blood except for pulmonary artery |
| veins start in blood capillaries | Arteries end in capillaries |
| They can be seen subcutaneously | They are deep seated |
| They collapse when there is no blood in it or cut across | They do not collapse when there is no blood in it |
| Veins are further divided into venules | Arteries are divided into arterioles |
| Veins are usually flattened or collapsed with thin walls | Round and thick walled |
| Veins have large lumen | Have small lumen |
| Veins are bluish in colour | They are reddish in colour |
| Show sluggish movement of blood | Give spurty movement of blood |
| If venous wall is injured blood comes out, collects in a pool in a small area around vein | If arterial wall is injured, blood comes out like a fountain in a large area all around the artery |
So, In veins thickest tunica is, tunica externa. Hence, the correct answer is option b.
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