In regard to heart and circulatory diseases, dogs have helped researchers develop which technology?

• A. Pacemakers
• B. Open-heart surgery
• C. Heart transplants
• D. Angiography

Answer: (A)

The main idea is how animal studies can drive the creation of devices that regulate heart function. Dogs provided a living model to test and refine electrical pacing of the heart. Researchers used canine hearts to figure out where to place pacing leads, how strong the electrical pulses should be, and how the timing of those pulses interacts with the heart’s natural rhythm. This work directly led to the development of implantable pacemakers that can keep a slow or irregular heart beating regularly, which is the core reason this technology emerged. While dogs have contributed to other areas of cardiovascular research, the most direct link to a widely used medical device for heart rhythm management is the pacemaker.