and intertitles to illustrate human anatomy and physiology. Beginning with the organs of respiration, it highlights the structure and function of the nose, larynx, trachea, bronchi, and lungs ...

But now, researchers at UCSF are showing it’s also happening in the lungs. They found hematopoietic stem cells (HSCs) in human lung tissue that make red blood cells, as well as megakaryocytes ...