Where is the cardiac center that regulates the electrical conduction system of the heart located?

• A. In the left ventricle
• B. In the medulla oblongata
• C. In the sinoatrial node
• D. In the right atrium

Answer: (B)

Verified step by step guidance

1. Understand the role of the cardiac center: The cardiac center is responsible for regulating the heart rate and the force of contraction through the autonomic nervous system.
2. Identify the location of the cardiac center: The cardiac center is located in the medulla oblongata, which is part of the brainstem.
3. Differentiate between the cardiac center and the electrical conduction system: The cardiac center in the medulla oblongata influences the heart's activity, while the electrical conduction system includes structures like the sinoatrial node and atrioventricular node within the heart.
4. Recognize the function of the sinoatrial node: The sinoatrial node, located in the right atrium, is the natural pacemaker of the heart, initiating electrical impulses that set the rhythm for heartbeats.
5. Clarify the role of the medulla oblongata: The medulla oblongata integrates signals from the body and adjusts heart rate and blood pressure accordingly, but does not directly conduct electrical impulses within the heart.