Air Breathing
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
Famous quotes containing the words air and/or breathing:
“Oh none too soon through the air white and dry
Will the clear announcer’s voice
Beat like a dove, and you and I
From the heart’s anarch and responsible town
Return by subway-mouth to life again,
Bearing the morning papers,”
—Richard Wilbur (b. 1921)
“To fair Fidele’s grassy tomb
Soft maids and village hinds shall bring
Each opening sweet of earliest bloom,
And rifle all the breathing spring.”
—William Collins (1721–1759)