2-17 Muscle structure function final

2-17 Muscle structure function final - Skeletal Muscle...

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Skeletal Muscle Function Muscle  structure  How are muscles formed? How do muscles contract? What are the different muscle fiber types? How does fiber type affect performance? Muscles: structure 3 basic types Cardiac Smooth Skeletal Skeletal muscle  is made of: Muscle FIBERS Fascia (connective tissue)    nerves 1.  Muscle  fibers Muscle fibers are made up of MYOFIBRILS  which contain “contractile” proteins  form “muscle” muscle fibers are bundled together 2.  Fascia Sheath that "wraps"              layers of skeletal muscle Fascia Form of connective tissue. Provides a “sliding and gliding” environment for muscles; suspends organs in their proper place; transmits movements from muscle to the bones they are attached to; and provides a supportive and mobile “wrapping” for nerves and blood vessels as they pass through and between muscles. Fascia:  muscle wrap 1.  Epimysium (outer) 2.  Perimysium (middle) 3.  Endomysium (inner) Connective tissue: EPImysi um Layer of connective tissue/fascia around the entire muscle (all the bundles) Epi=outer Connective tissue Perimysium 1
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Tissue surrounding individual           BUNDLES                           of muscle fibers Peri=middle Connective tissue  Endomysium Tissue between individual fibers Endo=            INNER              Connective tissue: tendons “non-stretchy” fascia (less-stretchy) Intramuscular connective tissue merges with dense connective tissue at each end of the muscle to attach it to              BONE                                   . Connective tissue tendons Tougher  than muscle/stronger than muscle Small tendon can withstand tension developed by larger muscles Blood supply Arteries/veins parallel the muscle  FIBERS     Blood supply: capillaries On average: per muscle fiber 3-4 Athletes? 5-7 per muscle fiber Implications for performance? To improve performance? 1.  Improve                      DELIVERY                                    or 2.  Improve extraction Blood supply How much do you need?  It depends…. Some mus cles may need 100x more blood during maximal exercise than at rest! How do muscles contract? The                 NERVE                                    -muscular system 3.  Nerve supply Nerves are both motor and sensory Motor nerve/ motor neuron nerves which exit the spinal cord and innervate (activate) muscle. Each motor nerve has a job……
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2-17 Muscle structure function final - Skeletal Muscle...

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