2010_Sem2_Skeletal Muscle_6BW

2010_Sem2_Skeletal Muscle_6BW - Skeletal Muscle BIOL1040...

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1 Skeletal Muscle Chemical energy to mechanical work BIOL1040 August 2010 Prof. Mike Bennett 417 Otto Hirschfeld (Building 81) Readings from Campbell (2006) pp. 1068-1074: (2008) pp. 1123-1137 Based on material prepared by Dr Carl Stephan The (skeletal) muscular system constitutes 40 - 50% of human body mass Organs: – Muscle tendon units – Heart – Visceral organs Tissues: – Skeletal muscle tissue – Cardiac muscle tissue – Smooth muscle tissue Cells: – Myocytes Molecules/Chemicals: – Actin / myosin / Ca 2+ Functions of the Muscular System • Convert chemical energy into mechanical work (= force x distance) Consequential roles: Movement (bones, blood, food etc.) Support (bony and soft tissue) Protection (guarding of orifices) Body temperature regulation Nutrient store Characteristics of Muscle Tissue Excitability and Conductivity – Ability to respond to stimuli producing action potentials Contractility – Ability to shorten and thicken E t ibilit Extensibility – Ability to be stretched without damage – Skeletal muscles often work in pairs: when one contracts the other relaxes and is usually stretched Elasticity – Strain energy storage In essence, contraction results from relative
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2010_Sem2_Skeletal Muscle_6BW - Skeletal Muscle BIOL1040...

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