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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