How do amphibians reduce blood mixing in frogs?

Amphibians, such as frogs, have a three-chambered heart consisting of two atria and one ventricle, which helps reduce blood mixing. The design allows for some separation of oxygenated and deoxygenated blood; oxygen-rich blood from the lungs enters one atrium, while oxygen-poor blood from the body enters the other. During contraction, the ventricle pumps blood, and the structure of the heart, along with the presence of a spiral valve in the conus arteriOSus, aids in directing blood flow appropriately, minimizing mixing. This adaptation is crucial for efficient oxygen delivery, especially during their active phases.