Biology Questions and Answers
- How does the swim bladder
of fishes work allowing fishes
to control their depth under
water?
From Hydrostaticobject does not sink is it is known that anf its density is
equal or less than the density of fluid in which it is immersed. the
When the swim blareduces the density of the fish body anddder is filled by gas it
when it is emptied this density is
increased. the fish depth under water.So this mechanism controls
- How do fishes do gas
exchange?
Fishes “brbranchiae, eath” through gills. Gills,are highly vascularized or
organs sunder water and present in aquaticpecialized in gas exchange (^)
animals (marine annelids, crustaceans,
fishes and tadpoles). Gillsrespiratory organ (analogous, for are a (^)
example, to lungs) containing very thin
lamellavessels in direct contact with water.e with many apparent blood
In osteichthyes tha bony flap that protects them callede gills are covered by
operculum. Ino opercula.n chondrichthyes there are
- Do fishes present an open
or closed circulatory system?
How many chambers does a
fish heart have? How does
blood flow throughout the fish
body?
As in every vertebrate the circulatory
system offlows only withi fishes is closed, i.e., bloodn blood vessels.
The fish heart has only two chambers: a thin-walled atrium aconsecutivend a
muscular(oxygenated) ventricle. Tblood comhe arteriales from the (^) gills
and gains arteries towards tissues, then
venous blood is collectereaches the atrium of the heart passingd by veins and (^)
to the ventricle that pumps the venous
blood towards thoxygenated. e gills to be again
- How is excretion done in
fishes?
Fishes hfiltrate thave a pair of kidneys thate blood. Bony fishes excrete (^)
nitrogen as ammoammoniotelic) and cartilaginous fisnia, NH 3 , (they arhese (^)
excrete urea as nitrogen waste (they
are ureotelic, like mammals). adult amphibians and
- What are the lateral lines
of fishes?
The lateral lines of bony fishes arsense organs that extend along bothe (^)
sides of the animalcontact with the environm body. They makeent by a
series of specialized scales that transmit
http://www.biology-questions-and-answers.com