Which function best describes the left ventricle's role in circulation?

• A. It stores blood before release
• B. It pumps deoxygenated blood to the lungs
• C. It receives blood from the superior vena cava
• D. It pumps oxygenated blood to all body tissues

Answer: (D)

Pumping oxygenated blood to the body is the left ventricle’s primary role. After the left atrium delivers blood rich in oxygen, the left ventricle contracts forcefully and sends this blood into the aorta, from which it travels through the systemic circulation to fuel all body tissues. This distinguishes it from the right ventricle, which sends deoxygenated blood to the lungs for oxygenation, and from the atria, which mostly receive blood. The left ventricle does not store blood; its job is to eject blood with enough pressure to sustain circulation throughout the body.