EDKP 206 Lecture Notes - Lecture 3: Vastus Lateralis Muscle, Soleus Muscle, Troponin
20 Feb 2013
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Movement: produce force, create movement/maintain posture, provide joint stability, transmit forces passivley i. e. to tendons/bones. Other non-movement related functions: support and protection of visceral organs, alter/control pressure within cavities, help maintain body temperature, control entrance/exits to the body. Largest smallest: fiber filaments (largest = myofibril) sacromeres myofilaments (actin/myosin) Was able to determine where the contractile portion of muscle was: before in ~1940"s we knew muscles were making forces, we just didn"t know how. Theory: muscle generates force by the sliding of actin and myosin myofilaments over one another. A band: does not change length during contractions. I band: do change length when muscle is stimulated. Together they form the functional components of the contractile portion of the muscle. Influencing factors of muscle"s ability to produce motion. Length of fibers: initial length will dictate how much force a muscle can produce, muscle can shorten to the length of the myosin myofibrils.
