Autonomic Nervous System Practice Questions
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Questions and Answers

What type of muscle does the somatic nervous system innervate?

  • Cardiac muscle and smooth muscle
  • Skeletal muscle (correct)
  • Glands
  • All of the above

    • What is the structure of the efferent pathways in the autonomic nervous system?

  • Three neurons, with the cell body of the postganglionic neuron in the CNS
  • Two neurons, with the preganglionic neuron synapsing with the postganglionic neuron (correct)
  • Two neurons, with the postganglionic neuron synapsing with the preganglionic neuron
  • One neuron extending directly to the effector

    • Which of the following statements about the autonomic nervous system is true?

  • It contains lightly myelinated or non-myelinated neurons with slow conduction (correct)
  • It is responsible for controlling voluntary movements
  • It is a part of the central nervous system
  • It contains heavily myelinated neurons with fast conduction

    • What neurotransmitter is released by all preganglionic neurons and some postganglionic neurons?

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

    What is the function of the postganglionic neuron in the autonomic nervous system?

    <p>To release neurotransmitters to the effector</p> Signup and view all the answers

    Which of the following statements about the somatic nervous system is true?

    <p>It contains heavily myelinated neurons with fast conduction</p> Signup and view all the answers

    Which cranial nerve contains parasympathetic fibers that control the pupillary reflex and also the shape of the lens?

    <p>oculomotor (III)</p> Signup and view all the answers

    Where do all preganglionic sympathetic fibers originate from in the spinal cord?

    <p>lateral horn</p> Signup and view all the answers

    Which of the following receives sympathetic input ONLY?

    <p>a and c</p> Signup and view all the answers

    What type of receptors bind acetylcholine?

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

    What happens to blood vessels when sympathetic fibers are stimulated?

    <p>they constrict</p> Signup and view all the answers

    What happens to the pupils in a brightly lit environment or in close vision?

    <p>they constrict due to parasympathetic innervation</p> Signup and view all the answers

    What is the precursor to retinal stored in the pigmented layer of the retina?

    <p>Vitamin A</p> Signup and view all the answers

    What is the correct order of neurons in the autonomic nervous system?

    <p>Preganglionic neurons; sympathetic postganglionic neurons; parasympathetic postganglionic neurons</p> Signup and view all the answers

    Which of the following activities is mediated by the parasympathetic nervous system?

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

    What is the correct order of layers of the neural retina that incoming light passes through?

    <p>Photoreceptors, bipolar cells, ganglion cells</p> Signup and view all the answers

    What type of photoreceptors are involved in color/high resolution vision?

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

    During increased physical activity, which type of receptors are found on the bronchioles and blood vessels serving the skeletal muscles?

    <p>Adrenergic B2 receptors</p> Signup and view all the answers

    Where are adrenergic B1 receptors primarily found?

    <p>On the heart</p> Signup and view all the answers

    Which disease is characterized by a build-up of aqueous humor in the eye, increasing the intraocular pressure?

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

    Which of the following statements is TRUE regarding parasympathetic fibers?

    <p>Their origin is craniosacral</p> Signup and view all the answers

    What happens to the ciliary muscles when sympathetic nerve fibers are stimulated to view a distant object?

    <p>They relax, decreasing the refractive power of the lens</p> Signup and view all the answers

    Which cranial nerve contains parasympathetic fibers?

    <p>Vagus (X)</p> Signup and view all the answers

    What is the light-absorbing molecule bound to a protein called opsin in visual pigments?

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

    What membrane do the hair cells of the spiral organ rest upon?

    <p>Tectorial membrane</p> Signup and view all the answers

    When sound enters the cochlea, which region will it pass through if it is within our frequency range?

    <p>All of the above</p> Signup and view all the answers

    What happens to the hair cell when the stereocilia pivot in the direction of the tallest stereocilium?

    <p>Na+ enters the hair cell and it depolarizes</p> Signup and view all the answers

    What would lead to conduction deafness?

    <p>A and B</p> Signup and view all the answers

    What happens to the hair cells when the basilar membrane vibrates?

    <p>The hair cells pivot back and forth</p> Signup and view all the answers

    Which structure in the midbrain is involved in the auditory pathway?

    <p>Inferior colliculus</p> Signup and view all the answers

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