Question

frog hearts have a chamber where deoxygenated blood can mix with oxygenated blood. what structure in the human heart prevent such mixing? atria pericardium septum blood vessels

Explanation:

The septum is a muscular wall in the human heart that separates the left and right sides, preventing the mixing of oxygen - rich and oxygen - poor blood. The atria are the upper chambers of the heart, the pericardium is the sac around the heart, and blood vessels carry blood to and from the heart, but none of these prevent blood mixing like the septum does.

Answer:

C. septum