The Heart, Part 2

What is the primary misconception about defibrillators as shown in TV shows?

• They are used to restart the heart

• They can cure any heart disease

• They are only used in hospitals

• They are not effective in real life

What makes cardiac cells unique compared to skeletal muscle cells?

• They are not striated

• They can generate their own electricity

• They have multiple nuclei

• They cannot contract on their own

What is the role of pacemaker cells in the heart?

• They prevent the heart from beating

• They regulate the heart's rhythm

• They cause the heart to stop during cardiac arrest

• They are only present in unhealthy hearts

Why does the signal get delayed at the AV node?

• To slow down the heart rate

• To ensure the atria finish contracting before the ventricles contract

• To allow the ventricles to contract first

• To prevent the heart from beating too fast

How does a defibrillator help during fibrillation?

• It permanently fixes the heart's electrical system

• It strengthens the heart muscle

• It stops the heart to reset its rhythm

• It slows down the heart rate