Which term denotes the tissue where a medication's effect is intended in arrhythmia therapy?

• A. Nerve Tissue
• B. Vascular Endothelium
• C. Cardiac Tissue
• D. Skeletal Muscle

Answer: (C)

Medications for arrhythmias are designed to change the electrical activity of the heart itself. Their purpose is to alter how cardiac muscle cells and the heart’s conduction system depolarize, repolarize, and conduct impulses, thereby modifying automaticity and conduction velocity to restore a normal rhythm. That’s why the tissue described as the target is cardiac tissue—the heart's own tissue where rhythm originates and is regulated. While some drugs can have secondary effects on nerves or blood vessels, the primary site for antiarrhythmic action is the heart, making cardiac tissue the correct focus. Nerve tissue relates to autonomic control, vascular endothelium to vessel function, and skeletal muscle is not involved in heart rhythm—so they aren’t the intended target.