________ Centrum

question 279

Multiple Choice

________ Centrum

• A) A
• B) B
• C) C
• D) D
• E) E

---

Definitions:

SA Node

The sinoatrial node, often referred to as the SA Node, is the natural pacemaker of the heart, responsible for initiating the heart's electrical impulses that regulate heartbeats.

Ectopic Focus

This term denotes an abnormal cluster of cardiac cells that generates heartbeats at an irregular rate or rhythm, different from the heart's primary pacemaker.

Respiratory Rate

The number of breaths taken per minute, a vital sign indicating breathing efficiency and metabolic activity.

Sinus Arrhythmia

A normal variation in heart rate that occurs with breathing, increasing during inhalation and slowing during exhalation.