EXPERTS predict an increase in shark attacks over the next few years thanks to a number of environmental initiatives.
The increase in fatal incidents has raised further questions about the composition of the deadly beasts compared to their human counterparts.
Do sharks have bones?
Sharks don’t have bones.
Instead, they use their gills to filter oxygen out of the water.
They are a special species of fish known as “elasmobranchs”.
That means they are made of cartilage.
In humans, this is the stuff that makes up our ears and the tip of our noses.
As a result, sharks do not have a skeleton in the traditional sense – the skeleton is made of cartilage.
Why do sharks have cartilage instead of bone?
Cartilage is strong, but unlike bone, it’s more squishy and can bend.
Although too rubbery to support a person’s weight, it is ideal for sharks.
According to Florida International University, sharks’ cartilaginous skeletons have helped them survive and thrive.
This is because cartilage is lighter than bone, meaning sharks don’t have to expend as much energy to swim.
Importantly, it prevents them from sinking when they stop swimming.
Cartilage also makes sharks faster and their jaws more flexible and stretchy.
They can open their mouths much wider, which means the force of their bite is much stronger.
Many large sharks, such as great hammerheads, will happily eat smaller sharks, while killer whales or killer whales will eat great white sharks.
Do sharks have a vertebra?
Yes, sharks have vertebrae.
Corresponding discoverySharks are classified as vertebrates because they have a human spine.
However, there is nothing in the definition that says it must be made of bone.
As in humans, the main function of a vertebra in a shark is to protect the spinal cord.
However, it is much more flexible than its human counterpart and essential to the way a shark moves and functions.
For example, the flexible vertebrae allow energy to be stored and compressed in the spine.
Scientists believe the stored energy released at the end of the tail flick helps sharks move towards prey or move away from a predator.
https://www.thesun.ie/tech/9207060/do-sharks-have-bones/ Do sharks have bones? | The Irish Sun