Fix grammar in this sentence: Because the heart pacemaker should be implanted into patient's body before it can work well, it asks for higher safety requirement.
The heart pacemaker is a device that is implanted in the chest of the patient to help the heart beat faster.
The heart is a muscle that pumps blood to the body.
The heart is a muscle that pumps blood to the body.
The heart is a muscle that pumps blood to the body.
The heart is a muscle that pumps blood to the body.
The heart is a muscle that pumps blood to the body.
The heart is a muscle that pumps blood to the body.
The heart pacemaker is a device that is implanted in the chest of the patient to help the heart beat faster.
The heart is a muscle that pumps blood to the heart.
The heart is a muscle that pumps blood to the heart.
The heart is a muscle that pumps blood to the heart.
The heart is a muscle that pumps blood to the heart.
The heart is a muscle that pumps blood to the heart.
The heart is a muscle that pumps blood to the heart.