In this page you can see SHARK ANATOMY. To
see the external morphology press here.
In the shark mouth there is the tongue,
while there are no salivary glands. The esophagus is enough wide
but brief and finishes with the stomach. It is wide, and
generally has the form of U. The intestine, simple and straight,
has some reliefs of the inside wall, (spiral valve, of various forms)
that increase the absorbent surface. The refusal substances go out to
the outside through the cloaca, that is a common opening for the
urinary, digestive and reproductive system.
The liver is very great and it can reach the 25% of the weight of
the shark. This organ has the function of energetic backup, and the
function od idrostatic organ. Sharks in fact don't possess the swimming
bladder (an inside afloat organ that can fill it with gas, present in
the bony fishes, whose function is above hidrostatic) and it is the
great liver, constituted to a large extent of oils, above all
squalene, lighter of the
water, to decrease the density of the body and to increase the buoyancy.
The heart is found in ventral position, next to the gills and it
is of enough redoubts dimension. The circulatory system is closed and
besides the heart there is an arterial system, that brings blood rich in
oxygen to all the organs (through the dorsal aorta), and a venous
system, that brings the blood rich in carbonic anhydride and organic
cinders to be purified and again oxygenated in proximity of the gills.
Marco Angelozzi -
E' assolutamente vietata la
riproduzione, anche parziale, del testo e del disegno
dello squalo presenti in questo articolo, senza il consenso dell'autore