Oh speaking of that let me tell you how muscle contraction works
"sigh" we have been walking forever, man my legs hurt
Man we past the house 2 blocks ago but it would be rude to stop him now
Muscle contraction is more commonly know as tightening the muscles. When you contract a muscle it is really activating tension-generating sites within the muscle fibers. In vertebrates we need a synaptic input from the motor neurons. There are lots of different types of muscle contractions that you like Isometric contraction or Isotopic contraction and way more. The pressure the muscle builds up is for example what allows a frog to jump as high as it can because the muscle in it's leg contract and then release..............