) The blood vessels which have thin walls are, Veins, Arteries, ) Both a and b, Neither a nor b, The organs present in the circulatory system are, Stomach, food pipe and intestine, Bones, muscles and cartilages, Heart, blood and blood vessels, Nose, trachea and lungs, The lungs are supported by dome-shaped muscle called, Rib cage, Capillaries, Diaphragm, Trachea, The heart contains two upper chambers known as, Arteries, Veins, Auricles, Ventricles, Identify the organ in the human body, heart, stomach, lungs, kidneys

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