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Mucles & Muscle Tissue, 9.3 Skeletal muscle fibers contain calcium…

- - - - -Served atleast one motor nerve
        
        each motor nerve contain nerves
        -Motor unit consists one motor neuron
      - THE MUSCLE TWITCH
        
        -Muscle is attached produces a myogram
        -Myogram show the amount of tension muscle
        -Muscle twitch is the response of muscle to a single stimulation
        
        Latent period
        
        Period of contraction
        
        Period of relaxation
        
        GRADED MUSCLE CONTRACTION
        
        -Frequency of stimulation causes temporal summation
        -Strength of stimultion cause recruitment
  - - - Concentric contractions are those which muscle shortens and does work
        -Eccentric contractions which the muscle generates forces as it lengthens
      - ISOMETRIC CONTRACTIONS
        
        -Isometric contractions, tension may build to the muscle peak tension producing capacity
        -Muscle contracts isometrically when they act primarily to maintain upright posture
        -Electrochemical and mechanical occuring within muscle are identical both
- - - - 1) number of capillaries surrounding the muscle fibers increases.
      - 2)number of mitochondria within the muscle fibers increases
      - 3) fibers synthesize more myoglobin
- - - - aligned, giving the cell its striated appearance.
  - - - -There are two types of contractile myofilaments in a sarcomere:
        
        ● The central thick filaments containing myosin (red) extend
        the entire length of the A band (Figure 9.2c and d).
        
        ● The more lateral thin filaments containing actin (blue)
        extend across the I band and partway into the A band.
- - - - unitary smooth muscle in walls of hollow organs
        
        longitudinal layer of smooth muscle.
        
        layer of circular smooth muscle
- - - - slow, prolonged contractile activity
      - smooth muscle tone
      - low energy requirements
- - - - Size of muscle fibers
        
        Degree of muscle stretch
- - - - A )Speed of contraction
        
        slow fibers and fast fibers
        
        Length-tension relationships of sarcomeres in skeletal muscles.
        
        B) Major pathways for forming ATP
        
        Classify skeletal muscle
        
        slow oxidative fibers
        
        fast oxidative fibers
        
        fast glycolytic fibers
        
        Structural and functional Characteristics of the three types of skeletal muscle fibers
- - - - acetylcholine binds receptors on the junctional folds of the sarcolesmma
        
        acetylcholine blinding causes a local depolarization called an end plate potential
        
        Muscle fiber excitation
        
        The local depolarization (EPP) triggers an axon potential in the adjacent sarcolemma
        
        Excitation contraction coupling
        
        axon potential in sarcolemma travels down to T tubules
        
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