HOSA Dental Terminology Practice

What is the role of atrioventricular valves?

1. To prevent blood from entering the lungs

2. To control blood flow between heart chambers

3. To maintain oxygen levels in the blood

4. To regulate digestive processes

The correct answer is: To control blood flow between heart chambers

The role of atrioventricular valves primarily focuses on controlling blood flow between the heart chambers. These valves, located between the atria and ventricles (the tricuspid valve between the right atrium and right ventricle, and the mitral valve between the left atrium and left ventricle), ensure that blood flows in one direction. When the atria contract, these valves open to allow blood to flow into the ventricles. When the ventricles contract, the valves close to prevent the backflow of blood into the atria. This function is crucial for maintaining efficient circulation within the heart and ensuring that blood is propelled effectively into the lungs and the rest of the body. In contrast, preventing blood from entering the lungs is not a function of the atrioventricular valves; rather, the pulmonary valves serve that purpose. Maintaining oxygen levels in the blood is managed by the lungs and the circulatory system, while regulating digestive processes is entirely outside the scope of the cardiovascular system. Thus, the focus and function of atrioventricular valves are correctly associated with controlling blood flow between the heart's chambers.