Question

heya !! answer the questions in the above pic.
◆answer right and properly and give explanation wherever required.

#ch-THE CIRCULATORY SYSTEM (class 10th).

Answer 1

Hey! 

i.  The veins have thin and less muscular walls, and have pocket-shaped valves to prevent back flow of blood.

ii.  Artery carry blood to an organ and break up into capillary ending in capillaries

iii. Walls of capillaries consist of single layer squamous epithelial cells.

iv. The substances to and from the tissues diffuse through the walls of capillaries.