The cardiac impulses originate from the ................ and are passed on to the bundle of His by …………………

Explanation

**Step-by-Step Solution:**

1. **Identify the Origin of Cardiac Impulses:**
- Cardiac impulses originate from the sinoatrial (SA) node, which is known as the natural pacemaker of the heart. It is located in the upper wall of the right atrium.

2. **Understand the Pathway of Impulses:**
- Once the cardiac impulses are generated by the SA node, they spread throughout the right atrium and then reach the atrioventricular (AV) node.

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