Bichirs possess paired lungs which connect to the esophagus via a glottis. They are obligate air-breathers, requiring access to surface air to breathe in poorly oxygenated water. Their lungs are highly vascularized to facilitate gas exchange. Deoxygenated arterial blood is brought to the lungs by paired pulmonary arteries, which branch from the fourth efferent branchial arteries (artery from the fourth gill arch), and oxygenated blood leaves the lungs in pulmonary veins. Unlike most lungfish and tetrapods, their lungs are smooth sacs instead of alveoated tissue. Bichirs are unique in that they breath using a recoil aspiration.
Read more about this topic: Bichir
Other articles related to "air, air breathing":
... SABRE (Synergistic Air-Breathing Rocket Engine) is a concept under development by Reaction Engines Limited for a hypersonic precooled hybrid air breathing rocket engine ... SABRE is an evolution of Alan Bond's series of liquid air cycle engine (LACE) and LACE-like designs that started in the early/mid-1980s for the HOTOL project ... The air breathing mode combines a turbo-compressor with a lightweight air precooler positioned just behind the inlet cone ...
... An air-breathing jet engine typically has a much larger specific impulse than a rocket for example a turbofan jet engine may have a specific impulse of 6,00 ... An air-breathing engine is thus much more propellant efficient than a rocket engine, because the actual exhaust speed is much lower, the air provides an oxidizer, and air is used as ... While the actual exhaust velocity is lower for air-breathing engines, the effective exhaust velocity is very high for jet engines ...
Famous quotes containing the words breathing and/or air:
“Ere I could
Give him that parting kiss which I had set
Betwixt two charming words, comes in my father,
And like the tyrannous breathing of the north
Shakes all our buds from growing.”
—William Shakespeare (15641616)
“Now Air is hushd, save where the weak-eyd Bat,
With short shrill Shriek flits by on leathern Wing,
Or where the Beetle winds
His small but sullen Horn,”
—William Collins (17211759)