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Why is sinuatrial (SA) node also called ...

Why is sinuatrial (SA) node also called the pacemaker of heart?

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**Step-by-Step Solution:** 1. **Definition of SA Node**: The sinoatrial (SA) node is a specialized cluster of cells located in the upper wall of the right atrium of the heart. 2. **Location**: It is situated at the junction of the superior vena cava and the right atrium, making it strategically positioned to regulate heart activity. 3. **Function of SA Node**: The primary function of the SA node is to generate electrical impulses. These impulses are crucial as they initiate the heartbeat and set the pace for the heart rate. ...
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Explain the following : (a) Why does the atrial systole normally precedes the ventricular systole ? (b) Why is S-A node called the pacemaker of the heart ? (c ) Why does the ventricle relax as a closed chamber in the early phase of its diastole ? (d) Why is there no mixing of deoxygenated and oxgenated blood in mammalian heart ? (e ) Why can you palpate the pulse on an artery in each heart beat ? (f) Why does the lymph contain much less proteins than the plasma ? (g) Why does the ventricle contract as a closed chamber in the early phase of its systole ? (h) Why is the closed circulatory system more efficient than the open one ? (i) Why does the left ventricle has a thicker wall than the right ventricle ?

Assertion : The AV node is also called as the pacemaker of the heart. Reasoning : It is because of the fact that the AV node determines the rate of heartbeat.

Why is the SA node called pacemaker of the heart ? Write its full from.