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Listed under:  Science  >  Life  >  Animal structure and function  >  Body systems  >  Nervous system  >  Receptors
Moving Image

Awake the mind with caffeine chemistry

Caffeine is the world's most popular drug, but what is it and how does our body respond to its presence? Watch this clip to see the chemical structure of caffeine and the three compounds it metabolises into. Find out which receptor in the brain caffeine binds to, and the overall impacts it has on brain function and activity.

Moving Image

Allergies: a big overreaction

An allergic reaction occurs when the human immune system makes a mistake and responds to harmless things such as pollen. Watch this clip to learn about the role that antibodies, immune cells, receptors and chemicals such as histamine play in triggering an allergic reaction. See an animated diagram showing the immune system's ...

Interactive Resource

Why are dogs such top smellers?

This engaging article outlines the science behind the sense of smell. It explains what makes dogs' noses and their sense of smell so powerful. It also describes how understanding the science has had implications for the potential development of new technologies.