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Sedentary, bottom-dwelling sharks generally use buccal pumping to move water over to their gills compared to more active sharks, who will use ram ventilation and swim to force water to their mouth and gills. Most sharks can switch between these mechanisms as the situation requires depending on the abundance of oxygen in the water.
Most sharks are "cold-blooded" or, more precisely, poikilothermic, meaning that their internal body temperature matches that of their ambient environment. Members of the family Lamnidae (such as the shortfin mako shark and the great white shark ) are homeothermic and maintain a higher body temperature than the surrounding water.
Some sharks are so flexible, they can bend right around and touch their tails with their snouts. Shark skin is so rough that in the past it was used to make a type of sandpaper, called shagreen. Without their fins, sharks wouldn’t be able to stay the right way up. They’d roll over in the water. Most sharks never close their eyes.
For this reason, many sharks and related fish feed very infrequently. The food passes into the comparatively short colon of the shark almost fully digested, and then out the cloaca and vent. A consequence of the spiral valve constricting the lumen of the ileum is that sharks cannot pass large hard objects (such as bones) through their lower ...
A video showing multiple sharks swimming close to the shoreline just south of Myrtle Beach, California, has gone viral, gaining over ten million views since it was uploaded on May 16.
It’s that time of year again: the thick of summer when sharks have caught America’s attention. Americans are spotting more sharks in the water. Here’s why that’s a good thing
Lateral line – sense organ that detects movement and vibration in the surrounding water; Shark cartilage – material that a sharks' skeleton is composed of; Shark teeth; Spiracle – pumps water across gills; Clasper – the anatomical structure that male sharks use for mating; Fish anatomy – generic description of fish anatomy
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