AFAA Personal Trainer Certification 2026 – 400 Free Practice Questions to Pass the Exam

The atria of the heart play a crucial role in the circulatory system by receiving blood that comes into the heart. There are two atria, the right atrium and the left atrium, which are located at the top of the heart structure.

The right atrium receives deoxygenated blood from the body's tissues through major veins, specifically the superior and inferior vena cavae. This blood is then pumped into the right ventricle, which sends it to the lungs for oxygenation.

Similarly, the left atrium receives oxygenated blood from the lungs via the pulmonary veins. This oxygen-rich blood is then passed into the left ventricle, which pumps it out to the rest of the body. Thus, the primary function of the atria is to act as receiving chambers, ensuring that the heart is filled with blood before it is pumped to the next stage of circulation.