The Human Body: Secrets of Your Life Revealed - Season 1 Episode 2 -

In this programme Chris and Xand van Tulleken discover the everyday miracles that keep you alive. They explore the extraordinary lengths our bodies go through to keep our bodies and organs working every second, of every hour, of every day - through the process of homeostasis. From surviving Nordic ice swimming, to seeing how powerful reflexes of fear and disgust keep us safe from danger, and uncover the amazing mechanisms our bodies call on to repair damage. And for the first time ever they see exactly how our immune system's killer cells go into battle against deadly infection.