The exhibition also features a 12th Century Medieval poo, a proctogram chair -designed for inspecting the rectum – and Victorian constipation cures.
It was curated with children from Harehills Primary School, one of nine local schools the Thackray works in partnership with.
Other questions the children posed included: ‘Why is a fart colourless?’, “How do you get constipated?” and “why is poo brown?”
Mr Gann said the “why is poo so smelly?” question inspired his favourite item in the exhibition.
He said: “Skatole, which is the chemical component that makes poo smell, is obviously a nasty smell when you get it in poo, but in a different amount it’s actually very pleasant.
“It’s in a lot of flowers and perfumes. So because we have collections that touch on that we can display some things that smell of poo but smell good.
“One of the objects on display is the anointing oil that’s used at the Royal Coronation, which is full of those floral ingredients, which all have skatole as a chemical compound in them.
“So we get to ask: does this smell of poo, does it make the King smell of poo?”