introduction2
DESCRIPTION
TRANSCRIPT
The Immune System
What is the immune system and why is it important?
Spleen and Thymus
The spleen destroys worn out red blood cells.
The thymus develops cells that attack viruses.
White Blood Cells
DESCRIPTION
TRANSCRIPT
The Immune System
What is the immune system and why is it important?
Spleen and Thymus
The spleen destroys worn out red blood cells.
The thymus develops cells that attack viruses.
White Blood Cells