PATHOLOGY MCQ
BLOOD VESSELS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
State the main functions of the valves inside veins.
|
|
support them
|
|
|
protect them
|
|
|
prevent the backward movement inside them
|
|
|
provide them elesticity
|
Explanation:
Detailed explanation-1: -The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle. Normal valves have 3 flaps (leaflets), except the mitral valve. It only has 2 flaps.
Detailed explanation-2: -Veins have valves which stop the blood from flowing backward. This is because blood pressure in veins is very low (compared to arteries).
There is 1 question to complete.