Chapter 5 Part B: Peripheral Nervous System - The Autonomic Nervous System
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Questions and Answers

What is the role of acetylcholinesterase at the neuromuscular junction?

  • It triggers opening of specific channels in the motor end plate
  • It prevents activation of AChE
  • It causes explosive release of ACh
  • It blocks the action of ACh at receptor sites (correct)

    • What is the consequence of black widow spider venom on the neuromuscular junction?

  • Causes flaccid paralysis
  • Activates acetylcholinesterase
  • Explosive release of ACh (correct)
  • Blocks release of ACh

    • What effect does botulism toxin have on the neuromuscular junction?

  • Causes flaccid paralysis
  • Blocks release of ACh (correct)
  • Triggers opening of specific channels in motor end plate
  • Activates acetylcholinesterase

    • How does curare impact the function of acetylcholine at the neuromuscular junction?

    <p>Blocks action of ACh at receptor sites</p> Signup and view all the answers

    Which disease is characterized by the loss of ACh receptor sites at the end plate?

    <p>Myasthenia gravis</p> Signup and view all the answers

    What is the cause of Amytrophic Lateral Sclerosis (ALS/Jou-Gehrig’s disease)?

    <p>Mitochondrial disfunction</p> Signup and view all the answers

    What is the function of organophosphates in relation to AChE?

    <p>Prevents activation of AChE</p> Signup and view all the answers

    What happens when Ion movements depolarize the motor end plate at the neuromuscular junction?

    <p>It produces end-plate potential (EPP)</p> Signup and view all the answers

    What effect does Myasthenia gravis have on muscle function?

    <p>Causes flaccid paralysis</p> Signup and view all the answers

    What is the outcome of exposure to organophosphates?

    <p>Prevents activation of AChE</p> Signup and view all the answers

    Which part of the autonomic nervous system is responsible for dominating in emergency or stressful situations?

    <p>Sympathetic nervous system</p> Signup and view all the answers

    In the autonomic nervous system, what type of receptors do cholinergic nicotinic receptors bind to?

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

    Which of the following is true about the parasympathetic system?

    <p>It has a long postganglionic fiber</p> Signup and view all the answers

    What is the primary neurotransmitter used by the postganglionic neuron in the sympathetic nervous system?

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

    Which receptor is found exclusively in the sympathetic nervous system and binds to norepinephrine and epinephrine?

    <p>Alpha receptor</p> Signup and view all the answers

    In which scenario would the Beta 2 receptor be involved?

    <p>Flattening of the lens for far vision</p> Signup and view all the answers

    What is the function of a muscarinic receptor in the parasympathetic nervous system?

    <p>Bind to acetylcholine released by postganglionic neurons</p> Signup and view all the answers

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