How Skeletal Muscles Move
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Questions and Answers

What type of signals are sent from the cerebral cortex to nerves associated with specific skeletal muscles?

  • Optic signals
  • Chemical signals
  • Motor signals
  • Somatic signals (correct)
  • Where does muscle contraction begin?

  • In the spinal nerves
  • In the brain (correct)
  • At the muscle fiber membrane
  • At the neuromuscular junction
  • What is the name of the place where the motor neuron reaches a muscle cell?

  • Neuromuscular junction (correct)
  • Synapse
  • Axon terminal
  • Myofibril
  • Which neurotransmitter binds to receptors on the outside of the muscle fiber to initiate muscle contraction?

    <p>Acetylcholine</p> Signup and view all the answers

    What happens within the muscle fiber when acetylcholine binds to receptors on its membrane?

    <p>Proteins reorganize to shorten and relax</p> Signup and view all the answers

    What type of nerve cell carries the action potential from the nervous system to the muscle fiber?

    <p>Motor neuron</p> Signup and view all the answers

    What is the name of the place where the motor neuron reaches a muscle cell?

    <p>Neuromuscular junction</p> Signup and view all the answers

    What initiates muscle contraction in response to the nervous system signal?

    <p>Action potential</p> Signup and view all the answers

    Which type of nerve cell is responsible for carrying signals from the cerebral cortex to nerves associated with specific skeletal muscles?

    <p>Motor neuron</p> Signup and view all the answers

    Which neurotransmitter is released by the motor neuron at the neuromuscular junction?

    <p>Acetylcholine</p> Signup and view all the answers

    What type of signal travels through spinal nerves to connect with nerves innervating skeletal muscles throughout the body?

    <p>Somatic signal</p> Signup and view all the answers

    Which proteins inside muscle fibers interact with each other during muscle contraction?

    <p>Actin and myosin</p> Signup and view all the answers

    What is the first step in the process that contracts a relaxed muscle fiber?

    <p>Binding of acetylcholine to receptors</p> Signup and view all the answers

    Which part of the nerve cell sends electronic signals to a motor neuron?

    <p>Axon</p> Signup and view all the answers

    What causes the reorganization of proteins inside muscle fibers during contraction?

    <p>Interaction of actin and myosin</p> Signup and view all the answers

    What does a multistep molecular process within the muscle fiber initiate?

    <p>Contraction and relaxation</p> Signup and view all the answers

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