What percentage of water is approximately present in human blood?

The human blood is composed of approximately 55% to 60% plasma, and this plasma is primarily made up of water, which constitutes roughly 90% of the plasma's composition. Therefore, considering the overall composition of blood, it is accurate to say that about 70% of blood is water when including the blood cells and other components. This understanding of blood composition highlights the crucial role water plays in maintaining various physiological functions, such as temperature regulation, nutrient transport, and waste removal. Thus, the correct response reflects the significant water content in blood that is essential for sustaining life and ensuring effective circulation and overall bodily function.