Question

when the heart goes through the heart twice during each cycle in other vertebrates​

Answer 1

Explanation:

the heart between ancestral vertebrates, the fishes, and the most derived forms, the birds and mammals. Fish have a simple two chambered heart which is, in essense, just a thickening of a section of the circulatory system, and the blood flows in a single circuit from heart to gills to body and back to the heart. Starting with the amphibians, the first of the vertebrates with lungs, the circulatory system adds a second loop or circuit. This design has the blood flow through the heart twice on each trip around the system, once on the way to the lungs and once on the way back from the lungs, giving it an extra boost. This is called double circulation.

In amphibians, with two atria but only a single ventricle, this results in the mixing of deoxygenated and oxygenated blood, but amphibians also gather oxygen through their moist skin, so this inefficiency is not critical. Beginning with the reptiles, a septum or wall develops that partly divides the deoxygenated from the oxygenated blood in the ventricle, and this is important because reptiles, with a watertight skin, rely entirely on their lungs for oxygen

Answer 2

Answer:

Hey bro this process is known as double circulation.