A Level Biology Practice Exam

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What is the function of tendinous cords in the heart?

To connect arteries to veins
To connect papillary muscles to heart valves
To stabilize the heart's position in the chest
To assist with blood flow through the lungs

The correct answer is: To connect papillary muscles to heart valves

The primary function of tendinous cords, also known as chordae tendineae, in the heart is to connect papillary muscles to the heart valves, specifically the atrioventricular (AV) valves, which include the mitral and tricuspid valves. These cords are crucial for the proper functioning of the heart's valve system. When the heart muscles contract, the papillary muscles also contract, which pulls on the tendinous cords. This action keeps the AV valves tightly closed, preventing the backflow of blood into the atria during ventricular contraction. The integrity of these tendinous cords is essential for maintaining unidirectional blood flow. If they were to rupture or weaken, it could lead to valvular incompetence, where blood could flow backward, potentially leading to serious cardiovascular complications. Thus, the tendinous cords play a vital role in ensuring that the heart functions efficiently and effectively, allowing for proper circulation throughout the body.