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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 ...
Having the ability to keep their warmth helps them as predators as well. Another group of sharks, known as the mackerel sharks are able to warm their blood. These mackerel sharks retain their blood by using a heat exchange system called rete mirabile. The body temperature of mackerel sharks can be up to 10 o higher than the surrounding water. [10]
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 can change shape. Swell sharks inflate their bodies with water or air to make themselves bigger and rounder. The insides of the sharks intestines are spiral shaped. Because of this, some sharks have spiral-shaped droppings. Some sharks are so flexible, they can bend right around and touch their tails with their snouts.
Shark meat is a seafood consisting of the flesh of sharks. Several sharks are fished for human consumption, such as porbeagles, shortfin mako shark, requiem shark, and thresher shark, among others. [1] Shark meat is popular in Asia, where it is often consumed dried, smoked, or salted. [2]
Now in its 13th season, "Shark Tank" gives entrepreneurs the opportunity to pitch their companies to some of the most successful business people in the world. These "Sharks" invest their own money ...
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They and their close relatives, the sharks, compose the subclass Elasmobranchii. Rays are the largest group of cartilaginous fishes, with well over 600 species in 26 families. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed on their ventral surfaces.