Blood is made mostly of liquid called plasma. Plasma is mostly water but also contains proteins, minerals and other substances. There are three types of solid particles, called formed elements, in blood: red blood cells, white blood cells and platelets. Red blood cells carry oxygen and carbon dioxide throughout the body. White blood cells help protect the body from disease. Platelets release substances that allow blood to clot, or stop bleeding.
Which formed element in blood is responsible for destroying bacteria and viruses?
A
plasma
B
platelets
C
red blood cells
D
white blood cells