What does the cardiac stimulator deliver to the heart?

What does the cardiac stimulator deliver to the heart?

• A. Pacing impulses
• B. Defibrillation shocks
• C. Oxygenated blood
• D. Electrical noise

Answer: (A)

The main idea here is understanding what a cardiac stimulator does. A pacemaker sends pacing impulses to the heart to prompt depolarization and contraction, thereby keeping the heart beating at a chosen rate when the natural rhythm is too slow or blocked. That electrical pacing signal is the therapeutic action of the device and is why the correct choice is pacing impulses. Other options describe different things: a defibrillator delivers high-energy shocks to reset a dangerous rhythm, not to maintain regular pacing; oxygenated blood is supplied by the circulatory system and lungs, not by a stimulator; electrical noise isn’t a therapeutic signal used to drive heartbeats.

The main idea here is understanding what a cardiac stimulator does. A pacemaker sends pacing impulses to the heart to prompt depolarization and contraction, thereby keeping the heart beating at a chosen rate when the natural rhythm is too slow or blocked. That electrical pacing signal is the therapeutic action of the device and is why the correct choice is pacing impulses.

Other options describe different things: a defibrillator delivers high-energy shocks to reset a dangerous rhythm, not to maintain regular pacing; oxygenated blood is supplied by the circulatory system and lungs, not by a stimulator; electrical noise isn’t a therapeutic signal used to drive heartbeats.