Explain the relative thickness: (a) of the muscle walls of the left and right ventricles (b) of the muscle walls of the atria compared to those of the ventricles

Describe, and identify on diagrams and photomicrographs, the structure of arteries, veins and capillaries, limited to: (a) relative thickness of wall (b) composition of wall (muscle and elastic tissue) (c) diameter of lumen (d) presence of valves