Which layer at the back of the eye detects light?

Which coloured ring in the eye controls how much light gets in?

What is the dark opening in the centre of the eye that light passes through?

Which snail-shaped part of the inner ear turns sound into nerve signals?

How many tiny bones are there in each middle ear?

As well as hearing, what else do your inner ears help you with?

The tongue map of separate taste zones is a myth. Where on the tongue can sweetness be tasted?

Which basic taste is usually described as savoury?

Much of what we call the flavour of food actually comes from which other sense?

What are the small sensors on the tongue that detect taste called?

Which sense organ detects touch, pressure and temperature?

Which organ receives signals from all of your senses and works out what they mean?

It is a myth that people use only a tenth of the brain. Over a normal day, how much of it is active?

Which part at the back of the brain coordinates balance and smooth movement?

Which curved brain structure is central to forming new memories?

Which lobe of the brain sits just behind the forehead?

Which lobe at the back of the head does most of the work of seeing?

What are the cells that carry electrical signals through the brain called?

What carries messages between the brain and the rest of the body?

Which nerve carries signals from the eye to the brain?

The lens focuses an image onto the retina. Which way up does that image land?

Which light-detecting cells in the retina work best in dim light?

Which thin stretched membrane vibrates when sound waves reach it?

What is the name for an automatic reaction, like blinking, that happens before you decide to do it?