today i learned – weds 2nd apr 2018

i feel like we’ve been missing shark week based facts for far too long now! 🦈

time to rectify that issue 😏

#tdil some sharks can detect one drop of blood/sweat/fish oils/etc in one million! 😱

this one genuinely amazes me … like, one part per million is literally insane! that said, a lemon shark can smell tuna oil at one part per 25 million 😳 that’s the equivalent of 10 drops of tuna oil in a normal sized home swimming pool!

but how on earth do they do it?! 🤔 prepare your brain for learning, it’s time to go full marine biologist 😏

unlike humans, sharks benefit from a nose that is solely designed for smelling; thanks to gills, it doesn’t need to concern itself with breathing 👍🏻 these nostrils are lined with special smelling cells.

as water flows through them, they can easily detect dissolved chemicals as they come into contact with the cells … this contact excites the receptors within the cells and is then fed to the shark’s brain as smells 👃🏻

due to the cells being super super super sensitive and sharks having an enlarged olfactory bulb in their brains, this system is capable of picking up even the tiniest trace of tasty fish/seals/humans 😅

for reference, the olfactory bulb is part of the olfactory system – the system that vertebrates use to smell things 👍🏻 it consists of tissues in the nose and the brain that use the aforementioned smell cells (aka olfactory epithelium) to detect odour molecules 😊

i thought that last bit might be useful as i realised that i have no idea what an olfactory bulb is 🤷🏻‍♂️

anyway! that’s everything for today! fairly short but still interesting 😁 hopefully you enjoyed 😘

have a gooden’

peace 😜 #tdil

________

has this epic shark fact not quite fulfilled your want for learning? no bother, just take a gander over ->here<-

(picture goodness! the header is ->here<-, picture one ->here<- and picture two ->here<- … yes, the header was an interesting choice 😂)

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