Uploaded October 2019 | Updated September 2026, 58 minutes ago
This video looks at how our body protects itself against disease. This includes the first line of defence like our skin and mucus in the nose. Our second line of defence is the white blood cells which are an extremely important feature of our defence system.
This video looks at how our body protects itself against disease. This includes the first line of defence like our skin and mucus in the nose. Our second line of defence is the white blood cells which are an extremely important feature of our defence system.










