Length Tension Relationship & Whole Muscle Behavior

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Length-Tension Relationship Optimum resting length (2.0–2.25µm) z z Overly contracted z z z Overly stretched z 1.0 Tension (g) generated upon stimulation 0.5 0.0 1.0 2.0 3.0 4.0 Sarcomere length (µm) before stimulation
Behavior of Whole Muscles • This is the response of a muscle to a weak electrical stimulus seen in frog gastrocnemius - sciatic nerve preparation • myogram – a chart of the timing and strength of a muscle’s contraction • weak, subthreshold electrical stimulus causes no contraction • threshold – the minimum voltage necessary to generate an action potential in the muscle fiber – produces a contraction – twitch – a quick cycle of contraction and relaxation when stimulus is at threshold or higher Muscle tension Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Time of stimulation Contraction phase Latent period Time Relaxation phase
Page 1 and 2: Chapter 11 Length Tension Relations
Page 3: Length-Tension Relationship • opt
Page 9 and 10: Contraction Strength of Twitches
Page 11 and 12: Twitch Strength & Stimulus Frequenc
Page 13 and 14: Incomplete Tetanus Incomplete tetan
Page 15 and 16: Contraction Strength of Twitches It

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