How fast does a decapitated head stop seeing?

We're told it's instantaneous, but is that true? Also, how does the bladder work, and why don't inverted bats get a blood head rush?

03 July 2020

Presented by Chris Smith with Kieno Kammies, 567 CapeTalk.

Production by Chris Smith.

GUILLOTINE

Credit:

CC0, via Pixabay

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What causes phantom limb pain? How does the bladder control when it fills and empties? What the F are food E numbers? Where does medical oxygen come from and will we run out? How fast does the brain switch off after decapitation? Why don't bats suffer a rush of blood to the head when they sleep upside down? And what causes catatonia? Join Dr Chris Smith and 567 CapeTalk's Kieno Kammies for the answers...