The Human Body Major Systems & Organs - The Circulatory System

The human body is a wondrously complex machine made of flesh, bone, muscles, organs, blood vessels and highly specialized systems that function together to sustain life. This fascinating third part of The Human Body series examines the incredible "machine," from simple cells, to DNA, the body's building blocks of life, to the major systems and organs. This video looks at the circulatory system and how it helps the cells in our bodies to function, especially the heart which pumps the blood around the body. The Human Body: Major Systems & Organs. Part 4