00:00What if your heartbeat could be controlled by a lab-made, living pacemaker?
00:04Chinese scientists just created something incredible.
00:07A tiny biological pacemaker grown in a petri dish.
00:11This breakthrough could completely change how doctors study heart disease
00:15and dangerous rhythm disorders.
00:17Your heart normally depends on a natural pacemaker called the sinoatrial node.
00:21It sends electrical signals that keep your heart beating every second of your life.
00:25But when it fails, the heartbeat can slow down or even stop.
00:30Now, researchers in China have successfully grown a mini-version using stem cells.
00:35And it actually produces stable heartbeats on its own.
00:38Even more shocking, scientists connected it with nerve cells.
00:42And the nerves were able to control the heartbeat, just like in a real human heart.
00:47They also recreated heart rhythm diseases inside the lab,
00:50then tested treatments that improved the abnormal heartbeat.
00:53This could open the door to safer drug testing, better treatments,
00:58and one day even personalized heart therapies.
01:01A tiny lab-grown heartbeat today could save millions of real hearts tomorrow.
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