All the multi-cellularorganisms are more sensitive to the...

All the multi-cellularorganisms are more sensitive to the effect of radiation than all theunicellular organisms. That the former have a more elaborate circulatory andrespiratory system than the latter, is well Known also in the blood relation ofcirculatory and respiratory system with heart.The action of radiation isretarded in the absence of oxygen and the blood-relation of oxygen with heartis known.Lastly the heat-flash of the atomic bomb explosion kills its victimthrough shock to the heart.