--%>

Description of neurotransmitter of neuromuscular junction

Give a brief description of neurotransmitter of neuromuscular junction? How does nervous system trigger the muscle contraction?

E

Expert

Verified

Nervous cells which trigger muscle contraction are motor neurons. Neurotransmitter of motor neurons is acetylcholine. When a motor neuron is stimulated depolarizing current flows along the membrane of its axon till reaching the synapse at neuromuscular junction (neural impulse passage zone between axon extremity and sarcolemma). Near the axonal extremity depolarization permits entrance of calcium ions in the axon (note that calcium also has a relevant function here). The calcium ions excite the neuron to liberate acetylcholine in synapse.

Acetylcholine then binds to special receptors into outer surface of sarcolemma, permeability of this membrane is changed and an action potential is created. The depolarization is then conduced along sarcolemma to sarcoplasmic reticulum that thus liberates calcium ions for sarcomere contraction.

   Related Questions in Biology

  • Q : Examples of representing being basic

    How are mammals categorized according to examples of representing beings, basic morphology, nitrogen waste, skin, circulation, respiration, thermal control and kinds of reproduction?

  • Q : Mechanism explained by the Darwin Write

    Write down the mechanism explained by the Darwin which eliminates species less adapted to environmental conditions?

  • Q : What is Frame Relay Frame Relay :

    Frame Relay: Telecommunications technology which breaks data stream into small data packets termed as frames, to give transmission speeds of 64 kilo bits per thousand (Kbps) to 2.4 giga bits per second (Gbps) at fairly lower costs. The Frame-relay equ

  • Q : Theories of Group Formation -

    There are four theories, which explain why the groups are formed. These include: 1)     Propinquity theory: quite often, individuals affiliate with one another because of spatial or geo-graphical proximity. In an organization, employees who work in the

  • Q : Contingencies-Develop Risk Response

    Contingencies-Develop Risk Response:A) What if the worst happens, or an unexpected event occurs? B) Technical risks – problematic C) Both schedule and cost risks need “trade-offs” Schedule r

  • Q : Define the term oesnophils Define the

    Define the term oesnophils? Answer: They are found in big number in allergic inflammatory actions and in the parasitic infections.

  • Q : Role of testicles in reproduction

    Regarding the reproduction state, explain the role of testicles?

  • Q : Positions of actin and myosin molecules

    Name the positions of actin and myosin molecules in sarcomere before and throughout the muscle contraction?

  • Q : Characterization of amphibians

    Characterize amphibians in accordance to the examples of representing beings, skin, basic morphology, nitrogen waste, respiration, circulation, thermal control and types of reproduction?

  • Q : Define the term corals Define the term

    Define the term corals?