Heart Anatomy and Circulatory Pathways Practice Test 2026 – Complete Exam Prep

Desmosomes serve as mechanical junctions that hold cardiac muscle cells tightly together at the intercalated discs, anchoring cytoskeletal fibers so the cells don’t pull apart during the strong contractions of the heartbeat. This mechanical coupling distributes tensile stress across cells, maintaining the integrity of the tissue as the heart beats. Electrical communication between cardiomyocytes is provided by gap junctions, not desmosomes, so desmosomes don’t conduct impulses. They also don’t pump ions; ion movement is handled by channels and pumps. In short, desmosomes keep the heart muscle cells mechanically connected under stress.