Physical Therapy Assistant Practice Exam

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Prepare for the Physical Therapy Assistant Exam with comprehensive flashcards and multiple-choice questions. Each question includes detailed explanations to ensure a thorough understanding. Boost your confidence and readiness for exam day!

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Which heart valves are closed during ventricular systole to prevent backflow into the atria?

Aortic and pulmonary valves
Mitral and tricuspid valves
Pulmonary and mitral valves
Aortic and mitral valves

The correct answer is: Mitral and tricuspid valves

During ventricular systole, the heart muscles contract to pump blood out of the ventricles. During this phase, it is essential to prevent the backflow of blood into the atria. The heart valves involved in this process are the mitral and tricuspid valves. When the ventricles contract, the pressure within them rises, causing these valves to close tightly. This closure maintains the unidirectional flow of blood and prevents any backflow of blood from the ventricles to the atria, ensuring efficiency in the heart's pumping action. The mitral valve is located between the left atrium and the left ventricle, while the tricuspid valve is between the right atrium and the right ventricle. Their closure during systole is vital for the normal function of the heart, emphasizing the importance of these valves in maintaining proper circulatory function. This mechanism is essential for efficient circulation as it allows for the proper ejection of blood into the aorta and pulmonary artery while safeguarding the atrial chambers from being filled with blood from the ventricles during contraction.