They serve as the policemen of the body by invading and fighting any foreign bacteria that could harm the body. Passing through the capillary walls, the white blood cells have powerful enzymes that eat offending bacteria. Pus that forms at the site of an infection is an indication that the white blood cells have been busy. Pus is primarily made of white blood cells and dead bacteria. Lymphocites are a type of white blood cell that enhances your immunity to infection and bacteria.
Plasma carries our digested food to the cells in our body to be utilised as energy.
It delivers carbohydrates, proteins, fats, minerals, salts and vitamins to the areas where they can do the most good. On it s return, the plasma carries waste products urea and uric acid to the kidneys. If the body is too hot, the capillaries near the skin open and the blood carries excess heat to the surface. When it is cold, the blood stays deeper inside the body and so conserve body heat. The blood, then, helps to regulate our body temperature at 98.6 degrees Fahrenheit.