What is the total volume of blood present in a healthy adult person? What are the different components of blood.

5.5 Litres of blood is present in a healthy adult person. The main components of blood are plasma and three types of blood cells, red blood cells, white blood cells and platelets. 

The average adult weighing 150 to 180 pounds should have about 1.2 to 1.5 gallons of blood in their body. This is about 4,500 to 5,700 mL. Pregnant women: To support their growing babies, pregnant women usually have anywhere from 30 to 50 percent more blood volume than women who are not pregnant.

The average adult has around 10 pints of blood (roughly 8% of your body weight). Making a blood donation uses about 1 pint, after which your body has an amazing capacity to replace all the cells and fluids that have been lost.The average healthy adult produces anywhere from 400 to 2,000 milliliters a day. Or on average, 34,400 liters in a lifetime.

Thus, It is healthy to donate blood. Health benefits of donating blood include good health and reduced risk of cancer and hemochromatosis. It helps in reducing the risk of damage to liver and pancreas. Donating blood may help in improving cardiovascular health and reducing obesity.