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"On MRI images, this decline can be seen as fatty degeneration of the muscle, where streaks of fat replace muscle fibers."

When you train your muscles, or get injured, these satellite cells are activated to form new muscle fibers.

Along with blue connective tissue and purple muscle fibers, the striped structure brings to mind …

Advocates suggest subsequent millennia spent chasing down prey shaped many unique human features, including our springy arched feet, slow-twitch muscle fibers optimized for efficiency, heat-shedding bare skin, and prodigious ability to sweat.

Cultivated meat is created by growing livestock cells in a nutrient-dense fluid, then layering them in a way that approximates muscle fibers.