1 – Internal gills where the blood is reoxygenated 2 – Point where the blood is depleted of oxygen and returns to the heart via veins 3 – Two chambered heart. Source: Internet
Amphibians The axolotl (Ambystoma mexicanum) retains its larval form with gills into adulthood The lungs of most frogs and other amphibians are simple and balloon-like, with gas exchange limited to the outer surface of the lung. Source: Internet
A small number of species have lost the ability to pump water through their gills and must swim without rest. Source: Internet
And they used to have a sport of bull-leaping: aristocratic teenagers, loaded up to the gills in gold and jewelry, swinging themselves over bulls.” Source: Internet
A second, dorsal aorta carries oxygenated blood from the gills to the rest of the body, and is homologous with the descending aorta of tetrapods. Source: Internet
But it really originated from a legitimate character perspective of: He needed to really confront himself and confront his ugliness, and what better represents his ugliness than the thing he’s most ashamed of, which is those gills? Source: Internet