Buccal pumping

buccal pumpbuccabuccal cavitygular pumpgular pumpinggulping air
Buccal pumping is "breathing with one's cheeks": a method of ventilation used in respiration in which the animal moves the floor of its mouth in a rhythmic manner that is externally apparent.wikipedia
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Respiration (physiology)

respirationrespiratoryrespiratory physiology
Buccal pumping is "breathing with one's cheeks": a method of ventilation used in respiration in which the animal moves the floor of its mouth in a rhythmic manner that is externally apparent.

Lung

lungspulmonaryright lung
These will be described for an animal starting with lungs in a deflated state: First, the glottis (opening to the lungs) is closed, and the nostrils are opened.
In early tetrapods, air was driven into the lungs by the pharyngeal muscles via buccal pumping, a mechanism still seen in amphibians.

Amphibian

Amphibiaamphibiansamphibious
It is the sole means of inflating the lungs in amphibians. This method of ventilation is inefficient, but is nonetheless used by all air-breathing amphibians and gular pumping is utilized to a varying extent by various reptile species.
Ventilation is accomplished by buccal pumping.

Reptile

reptilesReptiliaSauropsida
This method of ventilation is inefficient, but is nonetheless used by all air-breathing amphibians and gular pumping is utilized to a varying extent by various reptile species.
Varanids, and a few other lizard species, employ buccal pumping as a complement to their normal "axial breathing".

Carrier's constraint

surpassed those of "sprawling" reptiles
* Carrier's constraint
Monitor lizards increase their stamina by using bones and muscles in the throat and floor of the mouth to "gulp" air via gular pumping.

Manta ray

manta raysMantamantas
Manta ray embryos also breathe by buccal pumping, as mantas give live birth and embryos are not connected to their mother by umbilical cord or placenta as in many other animals.
With no umbilical cord or placenta, the unborn pup relies on buccal pumping to obtain oxygen.

Xenopus

clawed frogAfrican Clawed Frog (Toad)frog
Four-stroke buccal pumping is used by some basal ray-finned fish and aquatic amphibians such as Xenopus and Amphiuma.

Amphiuma

AmphiumidaeCongo eelCongo snake
Four-stroke buccal pumping is used by some basal ray-finned fish and aquatic amphibians such as Xenopus and Amphiuma.

Glottis

glottalglotticglottal opening
These will be described for an animal starting with lungs in a deflated state: First, the glottis (opening to the lungs) is closed, and the nostrils are opened.

Nostril

naresnaricornsnostrils
These will be described for an animal starting with lungs in a deflated state: First, the glottis (opening to the lungs) is closed, and the nostrils are opened.

Mammal

mammalsMammaliamammalian
Mammals, in contrast, use the thoracic diaphragm to inflate and deflate the lungs more directly.

Thoracic diaphragm

diaphragmdiaphragmatichemidiaphragm
Mammals, in contrast, use the thoracic diaphragm to inflate and deflate the lungs more directly.

Fish jaw

jawsjaw protrusionjaw
The original selective advantage offered by the jaw was probably not related to feeding, but to increased respiration efficiency—the jaws were used in the buccal pump to pump water across the gills.

Electric eel

Electrophorus electricuselectric eelsElectrophoridae
E. electricus has a vascularized respiratory system with gas exchange occurring through epithelial tissue in its buccal cavity.

Gnathostomata

gnathostomejawed vertebratesgnathostomes
It is believed that the jaws evolved from anterior gill support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively – the buccal pump mechanism.

Physostome

physostomous
This not only allows the fish to fill their bladder by gulping air, but also to rapidly ascend in the water without the bladder expanding to bursting point.

Evolution of fish

Prehistoric fishfossil fishfish fossil
The jaws were used in the buccal pump (observable in modern fish and amphibians) that pumps water across the gills of fish or air into the lungs in the case of amphibians.

Axolotl

Ambystoma mexicanumaxolotlsA-X-O-L-O-T-L
External gills are used for respiration, although buccal pumping (gulping air from the surface) may also be used to provide oxygen to their lungs.

Fish anatomy

spinesspinecaudal fin
The jaws were used in the buccal pump (observable in modern fish and amphibians) that pumps water across the gills of fish or air into the lungs in the case of amphibians.

Frog

frogsAnuraanuran
Ribs are generally absent, so the lungs are filled by buccal pumping and a frog deprived of its lungs can maintain its body functions without them.

Eucritta

Eucritta melanolimnetes
Its limb proportions support terrestrial preferences while skeletal features suggest that it utilized buccal pumping, the type of breathing used by modern amphibians.

Gait

gallopleaping gaitsaction
Thus, they cannot move and breathe at the same time, a situation called Carrier's constraint, though some, such as monitor lizards, can circumvent this restriction via buccal pumping.

Jaw

jawsgnathicjaw bone
The jaws were used in the buccal pump (observable in modern fish and amphibians) that pumps water across the gills of fish or air into the lungs in the case of amphibians.

Anatomy

anatomistanatomicalanatomically
Amphibians breathe by means of buccal pumping, a pump action in which air is first drawn into the buccopharyngeal region through the nostrils.

Komodo dragon

Komodo dragonsVaranus komodoensisKomodo
The Komodo dragon drinks by sucking water into its mouth via buccal pumping (a process also used for respiration), lifting its head, and letting the water run down its throat.