A healthy human has 4.7 to 5 litres of blood flowing in their veins and arteries. This amount of blood is maintained constantly and when a person drinks water, it gets into the arteries. The body then loses water through processes such as perspiration, urination and breathing. The extent to which arteries and veins are filled with blood determines a person’s blood pressure. High blood pressure can be a killer. It can damage blood vessels including capillaries in body organs such as the heart and brain, which can cause serious damage and even death. Since maintaining the pressure at normal levels is critical and needs to be done throughout life,…