Reflex Arc and Neurones Quiz
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Questions and Answers

What is the purpose of the refractory period in neurons?

  • To allow neurotransmitter to be made in the postsynaptic neurone
  • To ensure an action potential can only pass in one direction (correct)
  • To prevent the movement of action potentials
  • To amplify the effects of low frequency action potentials
  • Which principle states that an action potential is either produced or not, with all action potentials being of the same strength?

  • Threshold principle
  • Discrete signal principle
  • Synaptic transmission principle
  • All-or-nothing principle (correct)
  • How do synapses prevent action potentials from going in the wrong direction?

  • By making neurotransmitter in the postsynaptic neurone
  • By having neurotransmitter made only in the presynaptic neurone (correct)
  • By having receptors only on the presynaptic neurone
  • By releasing neurotransmitter many times in the postsynaptic neurone
  • What is summation in synaptic transmission?

    <p>Releasing neurotransmitter to reach the threshold value</p> Signup and view all the answers

    What is a role of excitatory synapses?

    <p>Facilitate the firing of action potentials</p> Signup and view all the answers

    In synaptic transmission, what can spatial summation involve?

    <p>Multiple presynaptic neurones releasing neurotransmitter</p> Signup and view all the answers

    What is the function of rod cells in the eye?

    <p>They provide low visual acuity in low light conditions</p> Signup and view all the answers

    Which region of the heart is referred to as the pacemaker?

    <p>Sinoatrial node</p> Signup and view all the answers

    Why do ventricles start contracting after the atria in the heart?

    <p>Tissue at the base of the atria delays the wave of excitation</p> Signup and view all the answers

    What is the role of the bundle of His in heart conduction?

    <p>Carrying the wave of excitation to the apex of the heart</p> Signup and view all the answers

    Which part of a nerve reflex arc is responsible for transferring signals from one neuron to another?

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

    What is responsible for the myogenic nature of the heart's contraction?

    <p>Sinoatrial node</p> Signup and view all the answers

    What is the correct sequence of components in a general reflex arc?

    <p>Receptor, Sensory Neurone, Intermediate Neurone, Motor Neurone, Effector</p> Signup and view all the answers

    What is the role of an Intermediate Neurone in a reflex arc?

    <p>Relays the nerve impulse from the sensory neurone to the motor neurone</p> Signup and view all the answers

    Which type of receptor detects changes in light?

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

    Where are Pacinian Corpuscles mostly found in the body?

    <p>Fingers and Soles of the feet</p> Signup and view all the answers

    What happens to stretch mediated sodium channels in a Pacinian Corpuscle under pressure?

    <p>They open</p> Signup and view all the answers

    Which part of a simple reflex arc carries the nerve impulse from the spinal cord to the effector?

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

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