The Human Body Major Systems & Organs - Respiratory 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 episode looks at the respiratory system particularly the functions of the lungs. The Human Body: Major Systems & Organs. Part 3