Which statement best describes the regenerative capacity of the liver compared with the heart?

Prepare for the Tissue Injury, Healing, and Pain Test. Utilize flashcards and multiple-choice questions with hints and explanations. Ensure you're ready for the exam!

Regenerative capacity differs between tissues: the liver can regenerate substantially, while the heart regenerates poorly and tends to heal with scar tissue. After acute liver injury or partial hepatectomy, mature hepatocytes can re-enter the cell cycle and proliferate to restore liver mass and function. This compensatory hyperplasia means the liver can largely return to its original size without needing stem-cell replacement, and scar formation is not the default outcome in this context. In contrast, adult heart muscle has limited ability to replace lost cardiomyocytes. When cardiomyocytes die after injury like a heart attack, the heart mainly forms fibrous scar tissue to preserve structure, but this scar does not restore full contractile function. That contrast—robust hepatic regeneration versus limited cardiac regeneration with scar—is what makes the statement describing substantial liver regeneration and limited heart regeneration the best answer.