NEET PG DENTAL EXAM

Detailed explanation-1: -Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don’t require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.

Detailed explanation-2: -Background: The ophthalmic and facial veins are frequently stated to be devoid of valves, facilitating the spread of infection from the mid-face to the cavernous sinus.

Detailed explanation-3: -Only the veins and not the arteries are provided with valves because Veins carry blood upwards away from an organ and towards the heart hence, have valves in their inner lining to prevent the backward flow of blood.

Detailed explanation-4: -The blood vessels called arteries are responsible for delivering oxygen-rich blood from the heart to the body’s tissues. Typically, arteries lack valves. However, there are valves on the two arteries exiting the right and left ventricles that stop blood from flowing backward.