Write the correct

(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