Pakistan, June 1 -- Chinese researchers have reached a significant milestone in cardiovascular science by creating the world's first laboratory-grown sino-atrial node, the part of the heart responsible for controlling its natural rhythm. The achievement could transform how scientists study heart disorders, test new medicines, and explore future treatments for patients suffering from irregular heartbeats.

The sino-atrial node, often called the heart's natural pacemaker, sits in the right atrium and generates the electrical signals that keep the heart beating steadily. These impulses coordinate the contraction and relaxation of the heart's chambers, ensuring blood circulates efficiently throughout the body and supports normal organ functio...