Muscle Physiology.

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Presentation transcript:

Muscle Physiology

Contraction Speed Figure 12.23 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Oxidative and Glycolytic Fibers Figure 12.24 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Muscle Fatigue Figure 12.25 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Muscle Attachments Figure 12.26 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Antagonistic Muscles Figure 12.27 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Muscle Spindle Figure 12.28 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Muscle Spindle Responses Figure 12.29 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Alpha / Gamma Coactiviation Figure 12.30 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Golgi Tendon Organs Figure 12.31 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Muscle Tissue Types Figure 12.32 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Properties of Smooth Muscle One nucleus Tropomyosin No troponin Dense bodies analogous to Z line Slow myosin ATPase Myosin has light chains Little sarcoplasmic reticulum Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Smooth Muscle Cell Figure 12.33 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Excitation-Contraction Coupling Ca2+ Calmodulin Phosphorylated myosin light chain Unphosphorylated Endoplasmic reticulum No myosin ATPase activity No crossbridge activity Myosin ATPase active Crossbridge cycling Contraction Smooth muscle cell MLCK Ca-calmodulin Figure 12.34 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Single-Unit Muscle Figure 12.35b Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Properties of Single-Unit Smooth Muscle Gap junctions Pacemaker cells with spontaneous depolarizations Innervation to few cells Tone = level of contraction without stimulation Increases/decreases in tension Graded Contractions No recruitment Vary intracellular calcium Stretch Reflex Relaxation in response to sudden or prolonged stretch Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Multi-Unit Muscle Figure 12.35a Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Multi vs. Single-Unit Muscle Figure 12.35 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Spontaneous Depolarizations Figure 12.36 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Cardiac Muscle Figure 12.37 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

Muscle Comparisons Table 12.2 Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings.

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