THE problem of the excitation-contraction link in muscle cells has long been one of the chief fields of modern muscle physiology 1–4. Of many reports in this field, one of the most interesting was the ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

THE method which was developed for measuring small rapid changes in volume occurring in a muscle during a single twitch 1 has been applied to the case of a frog sartorius muscle immersed in hypertonic ...