what happen if blood entering the heart mixed with blood leaving the heart?

If that happened, there was probably some trauma to the heart, so the organism would die.

Well but these r not proper answer

but gd anyways

iam a student of 7th but these are not actual ans

Well actually the heart will not have any oxygen and it will start having heart problems because of the pollution that has got inside of it

but how can blood be mixed????

Which is not the work of circulatory system

.

IF THE BLOOD MIXES SO WE WOULD DIE OR NOT??????