how have fish gills adapted for gas exchange?
250950
Fish use specialised surfaces called gills to carry out gas exchange. Gills are highly folded, giving them a large surface area and maximising the efficiency of gas exchange. ... The water that passes over the gill lamellae flows in the opposite direction to the blood within the gill lamellae.
203157
Single-celled organisms are aquatic and their cell surface membrane has a sufficiently large surface area to volume ratio to act as an efficient gas exchange surface. And since their oxygen requirement is less their exchange of gases can take place by simple diffusion througu their skin..
35060
['Gills or ability to hold breath underwater for long periods.', "Fins or limbs adapted for swimming, including webbed feet, for animals that don't spend all their time in the water, like otters and beavers;", 'Tails that act as paddles.']
485052
Fish can feel the weight of the air pressing on the water by sensing the pressure changes in the air of their organs, especially their swim bladder which controls their buoyancy. Fish with large swim bladders such as trout and salmon are even more sensitive to these pressure changes.
1429767
Since fish breathe through gills and there is no trachea that can be blocked, fish technically can't choke. However the gills do communicate with the oral cavity and typically require mouth movement to function. ... Such a diverse group of organisms as fish have lots of ways to cheat death by choking, however.
998880
Fish have adapted to their environment through the evolution of gills, swim bladders and fins. Gills allow fish to absorb oxygen from the water, swim bladders allow fish to maintain an appropriate level of buoyancy and fins allow the fish to move through the water.
750164
Fish need oxygen to survive. If your tank is loaded with toxic chemicals, like chlorine and ammonia, the fish get their own oxygen by floating to the surface and blowing bubbles. This is a sign that your fish are in danger. ... A fish tank air pump creates bubbles that remove undesirable gases from the water.
735131
These characteristics include: Live in water their entire lives. Vertebrates have a backbone, and some cartilaginous fish have vertebrae made of cartilage rather than calcium-hardened bone. Gills, which are slits on both sides of fish that allow for respiration, or the exchange of oxygen and carbon dioxide.
318397
The gills are composed of comb-like filaments, the gill lamellae, which help increase their surface area for oxygen exchange. When a fish breathes, it draws in a mouthful of water at regular intervals.
451802
Among the adaptations of pelagic crustaceans to these conditions are: (1) enhanced ventilatory abilities, (2) enhanced percentage removal of O2 from the ventilatory stream, (3) large gill surface areas, (4) short diffusion distances from the water to the blood, and (5) hemocyanin respiratory proteins with a very high ...
1261605
Fish swim by moving their tail from side to side. Marine mammals swim by moving their tail up and down. Fish have gills so they can breathe underwater. Marine mammals do not have gills.
1204732
In bony fish, the gills lie in a branchial chamber covered by a bony operculum (branchia is an Ancient Greek word for gills). The great majority of bony fish species have five pairs of gills, although a few have lost some over the course of evolution.
330083
Most fish have some type of structure or structures that are used to pump water over their gills in order to obtain oxygen. However, Albacore tuna have lost these structures and also do not possess a swim bladder.
647545
Adaptation. The clownfish has made many adaptations in order to survive better in its habitat. First, this particular species has more rounded caudal fins than other anemonefish, making it a naturally slow, less effective swimmer. These fins, however, enable the fish to make quick darting movements.
1183266
['Live in water their entire lives.', 'Vertebrates have a backbone, and some cartilaginous fish have vertebrae made of cartilage rather than calcium-hardened bone.', 'Gills, which are slits on both sides of fish that allow for respiration, or the exchange of oxygen and carbon dioxide.']
1298378
All loaches breath via their gills, but some are gifted with accessory breathing methods. Weather loaches (Misgurnus anguillicaudatus) are one of the most commonly available species, and they are capable of breathing through their gut. They will gulp atmospheric air and expel it via the anus.
736619
Although they have a similar book-like structure, book gills are external, while book lungs are internal. ... Book gills are flap-like appendages that effect gas exchange within water and seem to have their origin as modified legs.