All Class Clips content is available to watch on mobile, tablet and desktop devices on our new Knowledge & Learning BETA website.
White blood cells
Presenter Robert Winston explains our immune system can be likened to piranhas in the way it attacks foreign cells. He goes on to say that there are approximately 50 billion white blood cells in our bodies and that one of their functions is to engulf foreign cells. In vitro video footage of white blood and red blood cells is shown, as is the action of white blood cells engulfing bacteria.
This clip could be used to explain how white blood cells act as a defence against invading micro-organisms. This clip opens with a question - What cells in our body fight diseases and how do they do this? It therefore lends itself very nicely to reviewing this question at the end.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.