How Blood Moves - St. Jude The Basics of Blood

Cardiovascular System

The heart pumps blood throughout the body using a network of blood vessels. Blood is made of blood cells in a liquid called plasma. The cardiovascular system transports oxygen and nutrients to organs and tissues to keep them healthy.

Lymphatic System

The lymphatic system is part of the immune system. It is a network of lymphatic vessels, lymphatic fluid, lymph nodes, and organs including the tonsils, thymus, and spleen. It makes and stores white blood cells and carries them around the body to fight infections.