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Muscular Concept Map Emily Gallardo Period:1, Posterior, Anterior - Coggle…

- - - - 1.Action potential arrival;an electrical signal (action potential) travels down the motor neurons to the axon terimal
      - 2. Calcium influx signals open voltage gated calcium channels , allowing calcium ion to enter the neuron
      - 4. Binding to receptors:* ACh diffuses across the gap and binds to receptors on the motor end plate of the muscle fiber
      - 5. Muscle Depolarization: this binding opens ion channels , allowing sodium to rush into the muscle cell, creating a new electrical signal (end-plate potential)
      - 6. Contraction The signal travels along the muscle membrane (scarolemma) and into the T-tubes, eventually triggering the release of calcium inside the muscle to start the contraction cycle
      - 3. Neurotransmitter Releasecalcium triggers synaptic vesicles to fuse with the membrane, releasing the neurotransmitter acetylcholine (ACh) into the synaptic cleft
- - - - Repolarzation: K + channels opens , allows for sodium center the cels
      - Resting position : neuron returns to resting state
      - Depolarization:: Na + channels in membrane will open, this allows for sodium to enter the cell
- - - - A band: dark regions with thick myosin
      - I band: lighter regions with thin action
      - Z dics: coin-shaped sheet of proteins on mid line of light I band
      - M line:Middle of the A band; anchors and
        aligns myosin filaments.
      - H zones: Middle of the A band; contains only
        myosin, with no actin overlap.