Their main drawback is that they simply act as filler and do not trigger the growth of new tissue. (newscientist.com)
Since the body isn't moving, the muscles get the time they need to repair themselves and build new tissue by using the high - quality food you've eaten during the day. (fitnessandpower.com)
If wounded, a sponge doesn't need to grow new tissue; it simply moves old cells into the wound to close it. (discovermagazine.com)