Test_3_10-15-09.docx.doc

Test_3_10-15-09.docx.doc - Test 3 Characteristics of muscle...

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Test 3 Characteristics of muscle (myo) tissue - Excitability- receive and respond to stimulus - Contractility- ability to shorten (produces motion only by shortening, never pushes on a bone, just pulls) o Concentric- muscle actually shortens during activity Lifting with the biceps o Eccentric (DOMS) Not shortening In the weight room, holding a 100+ weight, muscle lengthens because weight is too heavy DOMS- delayed onset muscle soreness- Dr. Landin running a marathon, excessive eccentric contractions - Extensibility- elongated beyond its normal resting state o Stretch - Elasticity- return to normal shape after contraction, extension Functions of muscle tissue - Motion- gross (walking across the quad) or internal (stomach, large/small intestines) - Posture - Heat Categories of muscle tissue - Skeletal- voluntary, striated - Cardiac- involuntary, striated - Smooth- involuntary, non-striated Muscle Cell - Multi nucleate- more than one nucleus o Myoblasts
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Come together to form a single unit- each has a nucleus that it retains o Becomes a skeletal myofiber that is multi nucleate - Satellite o Like a stem cell- help to repair and remodel o Simply another myoblast that is on the surface of a developing muscle cell Fascia - Broad fibrous connective tissue, beneath skin, around myo and organs - Layers o Superficial- subcutaneous (deep to all of the skin), adipose, loose CT o Deep- most extensive, separates myo and components within myo, blood vessels, forms part of tendons o Subserous- deepest, covers viscera Parts of Muscle - Entire muscle covered by the epimysium (very superficial) - Fascical o Large longitudinal structures o Surrounded by perimysium - Muscle Fiber o Found in Fascical o Actual muscle cell** Myofiber- most common way to say muscle cell, single muscle cell Myocyte- also another name for muscle cell o Endomysium Surrounds an individual myofiber, immediately superficial to the plasma membrane of the myofiber o Parts of the muscle cell (myofiber)
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Sarcolemma- plasma membrane of the muscle cell Myofibril- round tubes going through the muscle cell (muscle is made up of lots of tubes inside of other tubes) Organelle within a myofiber Consist of thick and thin filaments parallel rows Sarcoplasm- cytoplasm within the muscle cell Mitochondrion Very active, need lots of ATP Sarcoplasmic reticulum Same as endoplasmic reticulum (SR), transport channel and the rest T tubules (transverse) Terminal cisterns- last channel before T tubules Triad is formed by the terminal cisterns and the T tubules** o The site for the release of calcium - Myofibril in detail o Thick filam ents are the myosin filam ents o Thin filam ents are the actin filam ents o Sarco m ere Runs from one Z disc (line) to the next Z disc Sections within a Sarco m ere Thick and thin filam ents that so m ewh at overlap e ach other in the relaxed stat e (Thick = red, thin = yellow) M line- connects the thick filam ents in the center of the
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Test_3_10-15-09.docx.doc - Test 3 Characteristics of muscle...

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