Plasma is the largest single component of blood. It consists of water, vital proteins, and other substances that play a role in coagulation, immunity, blood pressure, and transporting nutrients.

Blood plasma is a light yellow liquid that makes up about half of a person’s blood. Blood plasma is vital for fighting infection, maintaining correct blood pH levels, helping blood to clot, and ...

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of ...