I don't know how good you are at sketching ... I'm terrible. But you can put the point across in a dramatic way if you can sketch a bowling ball and a basketball ... you'll need to clearly identify them with the markings you sketch on each ball.
They're the same shape and nearly the same size, but there's a huge difference in their densities.
Explanation: El músculo esquelético está formado por fibras musculares, rodeadas de una capa de tejido conjuntivo, denominada endomisio. Las fibras se reúnen en fascículos primarios, que también están rodeados por otra capa de tejido conjuntivo, esta vez, más grueso, denominada perimisio.