Lec17 - Can you identify the parts of the muscle diagram on...

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Unformatted text preview: Can you identify the parts of the muscle diagram on the left? Responsiveness (excitability) to chemical signals, stretch and electrical changes across the plasma membrane Conductivity local electrical change triggers a wave of excitation that travels along the muscle fiber Contractility -- shortens when stimulated Extensibility -- capable of being stretched Elasticity -- returns to its original resting length after being stretched FORM IS FOR FUNCTION! IN Muscles, We See This Phenomenon especially well .. On The CELLULAR LEVEL Figure 3.4 Enormous!: Could have a diameter of 100um and can be length of a tendon ( up to 30 cm) They are MULTINUCLEATE (a result of embryonic developmentseveral myoblasts fuse togethereach myoblast contributes a nucleus to the myofiber. Satellite cells are unspecialized myoblasts that remain in myofiber. They are used for repair of damaged muscle fibers. Glycogen; This carbohydrate is abundant in myofiber. Myoglobin : Supplimental blood Pigment that carries oxygen to mitochondria under conditions of lower oxygen (hypoxia). Myofibrils-long protein bundles( these are the muscle fibers) The SR (Sarcoplasmic Reticulum); The function of this organelle is to act as reservoir of Calcium ions. SR- forms a network around each myofibril and exhibits dilated end- sacs called CISTERNAE . Sister-NAY Transverse Tubules (T-Tubules): These will signal SR...
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Lec17 - Can you identify the parts of the muscle diagram on...

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