Question

the flow of blood in veins is unidirectional. Give reason ​

Answer 1

Answer:

As muscles move, they squeeze the veins that run through them. Veins contain a series of one-way valves. As the vein is squeezed, it pushes blood through the valves, which then close to prevent backflow. ... Venous valve: Venous valves prevent back flow and ensure that blood flows in one direction