Healthy cells refer to normal, functioning cells within an organism that are working correctly and efficiently. These cells carry out their specific roles in maintaining overall health, such as producing energy, fighting off pathogens or repairing damaged tissues. A key characteristic of healthy cells is their ability to regenerate and divide in a controlled manner, which helps to replace old or damaged cells with new ones. In summary, "healthy cells" refers to the normal functioning of an organism's cellular structure, which contributes to overall well-being and homeostasis.