OCR GCSE Biology Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success

Stem cell-derived muscle tissue in the heart can act as a natural pacemaker due to its ability to generate electrical signals that regulate heartbeats. This therapeutic effect is particularly important in cases where the electrical conduction system of the heart is damaged or dysfunctional, as it can help restore proper rhythm and function.

The development of functional cardiac tissue from stem cells holds promise for replacing or repairing damaged heart tissue, which can improve overall heart performance. In contrast, the other options present effects that are not beneficial or appropriate for cardiac function. For example, reducing blood flow would be detrimental to heart health, while increasing fat tissue or making the heart larger could contribute to further complications rather than providing therapeutic benefits. Thus, the ability of stem cell-derived muscle tissue to function as a natural pacemaker is a key aspect of its potential therapeutic use in cardiac care.