Blood

The blood consists chiefly of a liquid called plasma and three kinds of solid particles known as formed elements. Plasma is made up mostly of water, but it also contains proteins, minerals, and other substances. The three types of formed elements are called 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 enable blood to clot. Platelets thus aid in preventing the loss of blood from injured vessels.

Red blood cells

White blood cells

Platelets