The right ventricle’s thick walls reflect its role in pumping blood to which circulation?

• A. Systemic circulation
• B. Pulmonary circulation
• C. Coronary circulation
• D. Portal circulation

Answer: (B)

The main idea is that the right ventricle drives blood into the lungs, so it uses the pulmonary circulation. The pulmonary circuit is low resistance and low pressure compared with the systemic circuit, which is why the right ventricle doesn’t need the same thick, muscular wall as the left ventricle. Its job is to propel blood into the pulmonary arteries for oxygenation, a task that fits a chamber designed for gentler afterload rather than high systemic pressure. By contrast, pumping to the rest of the body requires higher pressure, so the left ventricle has thick walls to generate that force. The other circulations listed—coronary (heart’s own blood supply) and portal (liver-related) —are not the pathways the right ventricle is built to push blood through.