Sharks possess the same senses
of the man, more other two to us strangers, that are the ability to
perceive the electric fields and the waves of pressure spreaded in
Taste: the sense of the taste in the sharks is insured from the
presence, in the mouth, but also on the surface of their skin, of
gustatory papille similar to those human. The shark therefore, can also
use this sense with the simple contact of the bodily surface.
Touch: along sharks body there are sensorial cells that are in
deep relationship with the gustatory papilles and let the shark realizes
when a physical contact happens.
Hearing: in the sharks it is present an inside ear, with the
ability to perceive above all sounds of low frequency as those sent
forth by wounded animals, and therefore potential preys for this superb
Sense of smell: the sharks nostrils, always well visible on the
inferior part of the face, are constituted by two channels to blind fund,
at the end there are cells that analyze the presence of fragrant
substances dissolved in water. The sensibilitynof the sharks is very
developed, it is thought that a shark can individualize 1 part of blood
in 100 million parts of water.
Sight: the sight of the sharks, contrarily to the popular thought,
is very developed. The pupil can tighten or to widen in base to the
light quantity, and in many sharks it is present, behind the retina, the
tapetum lucidum, a series of reflecting plates that amplify the light
andallow the sight also during the night. Under conditions of strong
illumination the tapetum lucidum is darkened, not to dazzle the retina
and to also provoke irreversible damages.
Side lines: the side lines, one for every side of the shark, are
constituted by sensorial cells that give the ability to perceive the
waves of pressure owed to the movements of the water.
Ampullae Lorenzinii: they are of the organs that take contact
with the outside through small and numerous holes, present especially in
the region of the head, full of a gelatinous conductor substance, in
communication with nervous terminations. In this way the shark has the
ability to perceive the electric fields produced by the animals (therefore
individualize preys under the sand) and probably to recognize their
position in comparison to the magnetic earth fiels.