The benefit of having this many chambers over organisms with fewer chambers is that it eliminates the need to mix the blood types before sending deoxygenated blood to the lungs and oxygenated blood to the rest of the body.
In a heart with four chambers, a septum entirely divides the left from the right. This stops the mixing of oxygenated and deoxygenated blood. This increases energy and improves oxygen supply. Numerous daily actions demand this energy.
Compared to the ventricles, the atria have substantially thinner walls. In comparison to the atria, the ventricles pump blood out at a higher pressure.
To learn more about deoxygenated blood, refer:-
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