Learn more about platelets, small types of blood cells that prevent excessive bleeding and serve other important purposes.

Learn about xylem cells, phloem cells, root hair cells and more. The four components of the blood There are four parts of the blood: red blood cells, white blood cells, plasma and platelets.

Plasma is a straw-coloured liquid that makes up just over half the volume of blood. Types of blood cell and cell fragments: red blood cells white blood cells platelets This table explains the ...