Evolution turns these knobs to make a hummingbird hyperquick and a cavefish sluggishly slow
Scientific American, February 24, 2023
Muscle is extremely important for regulating whole-body metabolism, said Dr. Tray Wright, who studies animal physiology at the University of Texas Medical Branch at Galveston. “In many animals, muscle mass can make up 40 to 50 percent of their body mass, and it is a really metabolically demanding tissue. By tuning that metabolism in the muscle, you really affect a lot of animal fitness.”