Question

__________ is considered to be the primary pacemaker of the heart.

(a) bundle of his

(b) sino-atrial node

(c) purkinje fibres

(d) atrio-ventricular node

This question was posed to me during an interview for a job.

The above asked question is from Biotelemetry Application on Wimax Networks topic in chapter Biomedical Telemetry of Biomedical Instrumentation

Answer 1

Right answer is (b) sino-atrial node

The best explanation: Located in the top right atrium near the entry of the vena cava, are a group of cells known as the sion-atrial node (SA node) that initiates the heart activity. Because of this is also considered as the primary pacemaker of the heart. The SA node is 25 to 30 mm in length and 2 to 5 mm in thickness.