Question

Fill in the blanks: (i) The have thin and less muscular , and have to prevent back flow of

• A. Walls
• B. Valves
• C. Blood
• D. Veins

Answer 1

Answer: (A), (B), (C), (D)

Veins, Walls, Valves, Blood.

• The veins are the blood vessels that have thin, muscular walls.
• This is because the blood flowing through the veins, flow at a reduced pressure.
• The veins have the presence of valves to prevent the backflow of blood.
• The probability of backflow of blood is more in veins as the blood flows at a very low pressure.