This article was originally published with the title “ The Embryological Origin of Muscle ” in Scientific American Magazine Vol. 211 No. 2 (August 1964), p. 61 doi:10.1038 ...

The origin is the end of a muscle which is attached to a fixed bone. The insertion is the other end of the muscle that is attached to the bone which moves. Muscular contractions are defined as the ...

Isotonic concentric contraction – this involves the muscle shortening. The origin and insertion of the muscle move closer together and the muscle becomes fatter. Isotonic eccentric contraction ...