Sense and Sensitivity

In the first of her lectures, Nancy Rothwell reveals how we are endowed with a multitude of sensors that help us regulate our bodies. This process of regulation – known as 'homeostasis' – is sensitive to even the slightest change in our environment. How we respond to these changes determines how well we fare in different situations. Nancy puts her own blood under the microscope to show the cells keeping her body in balance. Plus, Olympic champion Chris Boardman gets back on a bike to demonstrate the effect of exercise on our brain and blood.