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The fear of sharks, while perpetrated by the media in recent decades, has been around for all of humanity. Galeophobia is a primal instinct. [4] The fear of sharks stems from humans' attempt to avoid sharks, which was essential to our survival as a species over hundreds of thousands of years.
In general, sharks show little pattern of attacking humans specifically, part of the reason could be that sharks prefer the blood of fish and other common preys. [110] Research indicates that when humans do become the object of a shark attack, it is possible that the shark has mistaken the human for species that are its normal prey, such as seals.
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The shark's blood pressure falls by half as the blood vessels dilate to deliver more blood to the brain and heart. Unlike in bony fishes and tetrapods, the blood flow rate remains constant and there is no elevation of blood glucose levels. [18] The brains of sharks only consume a third as much ATP as those of teleosts. [16]
What to avoid to keep from attracting a shark. Although a bite from a nearby shark is generally a random occurrence, it’s better to err more on the side of caution.
Humans, 2 million years, even the ancestor of chimps and ourselves only takes it back to 6 million years ago, while sharks go back an incredible 450 million years.
Uncostumed humans, however, such as those surfboarding, light snorkeling or swimming, present a much greater area of exposed skin surface to sharks. In addition, the presence of even small traces of blood, recent minor abrasions, cuts, scrapes, or bruises, may lead sharks to attack a human in their environment.
Too much bleeding would attract sharks, so the oil kept the blood from seeping into the water. “If I am ever to write up the rule of swimming across the Florida Strait, I will definitely state ...