Your abdominals work hard when you swim. Also your legs if your kicking, and your shoulders push the water to move you forward.
all muscle groups are used.
They swim.
They swim
they relate because they dont move. ivoluntary muscle means that they dont move. the smooth muscle doesnt move at all only the skeletal muscle does.
To move a voluntary muscle, you just want to do it. When you want to walk, the nervous system sends a signal to the brain and the skeletal muscle to move your legs. So you are making your leg move by voluntary muscle, which is skeletal muscle.
To help the fish to swim.
When you want to move a muscle, your brain sends a message out to the muscle you want to move, and the muscle sends a message back to your brain that your moving it and where.
So they can swim
They swim
they swim
they swim
They swim