In human circulatory system, the all arteries:
1. are thin walled blood vessels
2. contain valves that prevent backflow
3. always carry oxygenated blood
4. carry blood away from hearth
Select the correct statements from the codes given below:

Answer: [D] Only 4

Arteries are thick-walled vessels that carry blood away from the heart. Blood moves by contracting muscles. 1, 2 are all characteristics of veins. Veins are thin-walled vessels (with valves) that return blood to the heart. Regarding third statement, while most arteries carry oxygenated blood, there are two exceptions to this norm, the pulmonary and the umbilical arteries.

This question is a part of GKToday's Integrated IAS General Studies Module