Which one of the following act as a pacemaker in heart?
Correct answer: B. Sino-atrial node
- A. Atria ventricular node
- B. Sino-atrial node
- C. Atria ventricular bundles of fibers
- D. Bundle of His
Explanation
The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the walI of the right atrium.
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