False. The two atria, the left atrium and the right atrium, do not hold the blood that circulates away from the heart. The atria receive blood that is returning to the heart from different parts of the body. The left atrium receives oxygenated blood from the lungs, while the right atrium receives deoxygenated blood from the body. After the atria receive the blood, they contract to pump it into the ventricles, which then pump the blood out of the heart to circulate throughout the body. So, the atria actually play a role in receiving blood, rather than holding blood that circulates away from the heart.
False. The two atria of the heart receive blood from the body and lungs, respectively. They do not hold the blood that circulates away from the heart.
