1. Cellular and molecular Physiology 三12 120 1.3 o∞O寸 690 5s 0.6 Measurement Measurement of [Ca2+ pf cell shortening1. Cellular and molecular Physiology Measurement of cell shortening Cell length ( m) 120 90 5s Measurement of [Ca2+]i 0.6 1.3340/380 5s