Why Is Our Skeleton On the Inside?

Why do some animals have exoskeletons and some have internal skeletons? This question popped into my head one day and the answer turned out to be more interesting than I could have imagined. Skeletons are amazing. Let me know what you thought of the video! I'm on Twitter & Instagram @DrJoeHanson @okaytobesmart

Evolution: Would you like to have skeleton inside or outside. Turtles: Yes.

"life remained squishy for a while" oh how I wish my biology teacher talked the way u did to me

The ironic part of the intro is that Strongman competitions do have plane pulling and Thor won the 2016 plane pull event.

I actually recall hearing from my Vertebrate Zoology professor that the exoskeletons of ancient vertebrates may actually have mainly functioned as calcium sinks to allow for calcium use in cellular functions, and it became repurposed for skeletal functions, which is pretty cool. Also, vertebrates aren't the only animals who turned inside out like this. Keepers of pet birds may recall the cuttlebones sometimes given to them in their cages. Apparently those internal "bones" cuttlefish have are actually the equivalent of the shells of nautilus/ammonites, so cephalopods put their shells on the inside as well. I've even heard of some cephalopod species which use these internal shells as muscle attachments, meaning they actually do have skeletal bones (albeit very few of them), which is pretty neat.

Evolution: Do you want skeleton inside or outside? Sharks: no

Exoskeleton: -Insane strength -less pain -sturdy -difficulty in uprighting oneself upon flipping -slow -permanently damaged exo armor Skeleton -extra dynamic and fluent mobility -lighter body -amplified pain -squishy externals -regenerable external armor -more room for modifications

I would love to see what we would look like if by chance there was other alkaline earth metal rather than calcium.

Biology was my favorite class in school. The thought of a completely different evolution just makes the mind wander haha. It's a fun thing to think about

"you're just meat, in a sack, tied to a bunch of carefully organized rocks" Existential crisis: "heya imma here"

Imagine you have an exoskeleton and your back starts itching.

Its hard to imagine how elephantsize crab would molt. Without skeleton It would just flatten out.

Love this video and I have a sci-fi novel I'm writing about our final layer being proper shield technology suited for any environment. Great work man. Good videos.

Plot twist: humans are actually meat mechas being piloted by an advanced organic A.I. wich weighs roughly 3 pounds....

I wouldn’t attempt to arm wrestle that chimera ant if I were you

I swear that little animation of the Mountain waddling around cracked me up real good

Joe: I'm so tired of nachos Me: Finishes about a sixth plate of nachos me too

"Hey smart people " You're making a lot of assumptions here

Me: Imma go to sleep Youtube: Why do you have skeleton

I learnt a lot from this video so thanks for educating us