Answer :

(a) The sequence of oxygen rich blood flow from the lungs is as follows

oxygen rich blood leaves lungs via pulmonary vein


left Atrium receives pulmonary aorta


blood flows from the left atrium to the left ventricle


from left ventricle blood gets pumped to the aorta which branches to different major organs


(b) When a system of blood vessels develop a leak


the damaged cells attracts platelets and phagocytes to the region


phagocytes start to leak out looking for possible pathogens and digesting them


platelets start to clump the leak and close the blood vessels to prevent blood leakage


fibrin fibers form the clot which adds to closure of the leak


tissue repair starts


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