Muscular System - Chapter9:MuscularSystem...

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Chapter 9: Muscular System Functions of Muscular System: o Responsible for movement of parts of the body (motion) o Maintenance of posture and tone (stabilization) o Respiration (muscles of thorax) o Production of body heat (when muscles contract) o Communication (speaking, writing, typing, facial expressions) Properties of Muscle o Contractility: shortens/contracts forcefully Structures move or pressure inside an organ/vessel increases o Excitability: responds to stimuli  Conscious/unconscious By nerves and hormones o Extensibility: can be stretched/lengthened beyond resting length and still  contract o Elasticity: recoils to resting length after stretch Skeletal Muscle Structure o Table 9.1 (pg 276) To identify the components of a skeletal muscle fiber. Each skeletal muscle fiber is a multinucleated, striated cell containing a large number  of rod-like myofibrils that extend, in parallel, the entire length of the cell. Each  myofibril is composed of still smaller units, called myofilaments, that contain the  contractile proteins actin and myosin. o Skeletal muscle fibers (the cells) o Superior to deep: Fig. 9.1 (pg 277) Muscular fascia (dense irregular collagenous connective tissue) Arteries, nerves (motor neurons), veins Epimysium (dense collagenous connective tissue) Skeletal muscle belly, arteries, nerves (motor neurons), veins Perimysium Muscle fasciculi (bundles) Endomysium Muscle fibers, capillaries, veins, neurons, neuromuscular junctions Sarcolemma (surround myofibrils) 
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Muscular System - Chapter9:MuscularSystem...

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