Use your knowledge of muscle arrangement to describe the processes of muscle excitation- contraction. 1. Make sure you describe the main components of the neuromuscular junction; 2. how an action potential leads to excitation-contraction; 3. the fate of acetylcholine following binding to its receptor; 4 the release and roles of calcium; 5. the sliding filament mechanism; and 6 how the muscle fiber contraction results in body movement.
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- **Synaptic Cleft**: The small gap between the motor neuron and the muscle fiber. - **Motor End Plate**: The specialized region of the muscle fiber membrane that contains receptors for the neurotransmitter acetylcholine (ACh). - **Synaptic Vesicles**: Located in Show more…
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describe a skeletal muscle fiber contraction starting by exciting a motor neuron with an EPSP. talk about local potentials leading to an action potential. Describe an action potential and what it causes at the axon terminal. Talk about neuromuscular junction, the motor end plate(whats found here and nowhere else in the muscle fiber?) the excitement of the muscle fiber, what happens inside the cell when it is excited. Mention the regulatory proteins and the contractile proteins and their involvement in the contraction. Lastly, describe how the muscle relaxes.
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Describe the physiological events of muscle contraction. Begin by describing how an action potential is generated in the nervous tissue, and with as much detail as possible describe what happens at the nero muscular junction, excitation contraction coupling, and Crossbridge cycling.
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1. What is the initial stimulus for muscle contraction? 2. Which neurotransmitter is released at the neuromuscular junction after the action potential arrives? 3. When receptors open at the neuromuscular junction, does sodium travel in or out of the muscle fiber? 4. The action potential continues to travel down the muscle fiber on which structures? Which ion is released from the sarcoplasmic reticulum as this happens?
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