Figure 11.
(a) Different time scales of the twitch responses in (1) a mammalian gastrocnemius muscle, (2) a mammalian soleus muscle, and (3,4) a frog sartorius muscle at 10 °C (3) and 7 °C (4). (The maximum tensions here have been normalised to the same scale). (b) Variation of tension response in a twitch muscle with different stimuli: (A) response to a single stimulus (pulse), (B) response to two closely–spaced stimuli, (C) unfused tetanus produced by repetitive stimulation at moderate frequences, and (D) fused tetanus induced by repetitive stimuli arriving faster than the fusion frequency. Tmax is the maximum tension, sometimes called Po. The horizontal axis is time (seconds). Adapted from [3] after [75].