Mammalian and bird hearts
A) pump only oxygenated blood.
B) pump only oxygen-depleted blood.
C) pump both oxygenated and oxygen-depleted blood but the two do not mix in the heart.
D) have only partially divided ventricles,to allow mixing of oxygenated and oxygen-depleted blood.
E) is a single circulatory loop system.

Question

Quizplus · Accepted Answer

Mammalian and bird hearts have four chambers, with the left and right atria receiving oxygenated and oxygen-depleted blood, respectively, and the left and right ventricles pumping out oxygenated and oxygen-depleted blood, respectively. However, the two types of blood do not mix in the heart due to the presence of a septum dividing the atria and ventricles. This allows for efficient delivery of oxygen to the body and prevents mixing of oxygenated and oxygen-depleted blood.

Mammalian and Bird Hearts