Between the two lower chambers sits the

Between the two lower chambers sits the

• A. interventricular septum
• B. interatrial septum
• C. atrioventricular valve
• D. Chordae tendineae

Answer: (A)

Between the two lower chambers sits the interventricular septum. This thick muscular wall fully separates the right ventricle from the left ventricle, keeping the blood on each side distinct and enabling the left ventricle to generate higher mean pressures for systemic circulation. It also houses part of the heart’s conduction system, which helps coordinate ventricular contraction. The other structures listed don’t form the wall between the ventricles. The interatrial septum lies between the atria, not the ventricles. The atrioventricular valve is the valve at the junction of an atrium and a ventricle. The chordae tendineae are the tendinous cords that tether valve leaflets to papillary muscles.

Between the two lower chambers sits the interventricular septum. This thick muscular wall fully separates the right ventricle from the left ventricle, keeping the blood on each side distinct and enabling the left ventricle to generate higher mean pressures for systemic circulation. It also houses part of the heart’s conduction system, which helps coordinate ventricular contraction.

The other structures listed don’t form the wall between the ventricles. The interatrial septum lies between the atria, not the ventricles. The atrioventricular valve is the valve at the junction of an atrium and a ventricle. The chordae tendineae are the tendinous cords that tether valve leaflets to papillary muscles.