The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.
Function of the Septum
Y is the septum
The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.
Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.
More on the heart's septa can be found here: https://brainly.com/question/17295714
#SPJ1
