Fig. 4
From: Regulation of myocardial contraction as revealed by intracellular Ca2+ measurements using aequorin
Modified from Fig. 2 of [4] with permission.
Effects of changes in muscle length on CaT and tension. A Experimental records showing the changes in CaT and tension following length changes. CaT and tension were measured at Lmax and when a length change was applied to 82% Lmax. Top trace, CaT; middle trace, muscle length; bottom trace, tension. In this experiment, muscle length was changed by a micrometer, and therefore, the CaT recording was discontinued for ~ 20 s during the length change. Cat ventricular papillary muscle was used. B Averaged records of CaT (top) and tension (middle) from 32 twitch contractions over the periods shown in A, i.e., (i), (ii), (iii), (iv) and (v). The “notch” on each bottom trace indicates the stimulation point.