Biology Topic Practice

Natural and Artificial Pacemakers

Your resting heart rate is controlled by a group of specialized cells in the right atrium that act as a natural pacemaker.

What happens if the natural pacemaker fails?

What is Natural and Artificial Pacemakers?

"A pacemaker is a system (natural or artificial) that regulates the rhythm of the heart."

Question 1

What is the main function of the heart?

Question 2

Which side of the heart pumps blood to the lungs?

Question 3

Why are the walls of the left ventricle thicker than the walls of the right ventricle?

Controlling Heart Rate

Special cells send electrical impulses to trigger muscle contraction.

Artificial pacemakers are electronic devices implanted under the skin.

They correct irregular heart rhythms (arrhythmias).

Exam Tip

The natural pacemaker is located specifically in the wall of the right atrium.

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