Aquatic respiration is the process whereby an aquatic animal obtains oxygen
from water. ... Fish use the process known as countercurrent flow, in which water
and blood ... The respiratory system of ...
Apr 19, 2009 ... Fish use their gills to take oxygen from the water that they live in. But people get
the ... Whales and dolphins use their lungs to breathe air also.
No, whales don't have gills; instead they are born with blowholes. ... to extract
oxygen directly from the water so that they can breathe underneath the water ...
Whales are marine mammals and like all mammals they have lungs and nostrils,
Aug 5, 2009 ... (By the way, this is why we couldn't breathe liquid unaided, as in the film The ...
Well, their gills are much more efficient at extracting oxygen than our lungs. ...
With an unlimited, easy supply of oxygen, whales and dolphins can ...
A whale can hold it's breath for up to half an hour under water and that's because
its ... to ours, but when it breathes in fresh air most of its lungs are filled with air.
Like other mammals, dolphins have lungs and breathe air. They breathe using a
blowhole on top of their head and will normally do this several times a minute.
Dec 19, 2009 ... Fish use gills to breathe. This means they can't drown, and don't need to surface
to breathe.Aquatic mammals like whales have lungs. Not good ...
The air-breathing lungs of mammals, including humans, must be dry and empty
of ... As water passes over the thin walls of the gills, dissolved oxygen moves into
the ... If fish can breathe underwater, then why do some fish, like dolphins and
whales, swim to ... When a whale or dolphin surfaces, it breathes air through its
Feb 23, 2015 ... ... to do so? If there is some advantage to breathing from the air instead of using
gills, why haven't animals such as sharks (or indeed fish in general) evolved to
do this instead? ... There are advantages to lungs in whales.
Gills can only introduce a small amount of oxygen per liter of water, while lungs
can ... so organisms with lungs only need to process about 4 grams of air per
breath. ... Whales and dolphins are mammals that live in water, and they have