A function of the fibrous skeleton of the heart is to provide ______ insulation between the atria and ventricles.

• A. thermal
• B. chemical
• C. electrical
• D. mechanical

Answer: (C)

Verified step by step guidance

1. Understand the fibrous skeleton of the heart: It is a dense connective tissue structure that provides support and separation between the atria and ventricles.
2. Recognize the primary function of the fibrous skeleton: It acts as an electrical insulator, preventing the direct transmission of electrical impulses between the atria and ventricles.
3. Eliminate incorrect options: Thermal insulation refers to temperature regulation, which is not a function of the fibrous skeleton. Chemical insulation involves preventing chemical interactions, which is also irrelevant here. Mechanical insulation refers to physical separation but does not address electrical conduction.
4. Focus on the correct option: Electrical insulation is the key function of the fibrous skeleton, ensuring that electrical impulses are routed through the atrioventricular (AV) node for proper coordination of heart contractions.
5. Conclude that the correct answer is 'electrical,' as it aligns with the role of the fibrous skeleton in maintaining the heart's electrical conduction system.