Now instead, let's suppose instead of raising this marker I take some type of weight. And that weight let's suppose has a very large mass. So now because I'm trying to lift a very large mass I'm going to have to use many more motor units. And so now let's suppose I'm using all three of these motor neurons and that means I'm using all three of these motor units. And this as a result of me using more of these motor units I will produce a greater force because more of these motor units contain more of these muscle cells and so I will exert a greater force. So if we stimulate many motor units to carry out a certain activity this will produce a greater force than if we use a smaller number of motor units.