Chapter 13 Quiz: The PNS And Reflex Activity

__________ are receptors that can respond to painful stimuli. Mechanoreceptors Chemoreceptors Nociceptors Photoreceptors

Which of the following is NOT used to classify sensory receptors? structural complexity location the type of stimulus they detect the number of dendritic endings present

In order for you to realize there has been a sensory change, it has to reach the __________ level of processing. circuit receptor abstraction perceptual

__________ do NOT exhibit the property of adaptation. Phasic receptors Sensory receptors Tonic receptors Photoreceptors

CNS nerve fibers regenerate because of the actions of Schwann cells. True False

Choose the FALSE statement about nerves. Nerves can carry only sensory information, only motor information, or a mixture of sensory and motor information. Axons make up a majority of the matter in a nerve. Nerve axons are surrounded by a loose connective tissue layer called the endoneurium. Nerves consist of parallel bundles of myelinated and nonmyelinated axons.

Spinal nerves are all classified as __________. sensory nerves afferent nerves mixed nerves motor nerves

In carpal tunnel syndrome, the __________ is compressed. radial nerve musculocutaneous nerve axillary nerve median nerve

Which of the following lists the hierarchy of motor control from lowest to highest level of control?

Segmental refers to which level of motor control? brain stem spinal cord cerebellum basal nuclei

The knee-jerk reflex is an example of a __________. flexor reflex superficial reflex tendon reflex stretch reflex

The sensory division of the PNS is also known as the efferent division. True False

Three main levels of neural integration operate in the somatosensory system. Which level involves the spinal cord? perceptual level circuit level integrative level receptor level

Sensory stimuli that activate receptors generate action potentials that are sent into the CNS. True False

The hyperalgesia that is common in phantom limb pain could be blocked if a new drug was developed that could prevent (without triggering any side-effects) the ______. diffusion of calcium ions through NMDA receptors release of enkephalins binding of enkephalins to NMDA receptors diffusion of enkephalins across synaptic clefts

Which of the following characteristics is representative of receptor-level processing, NOT perceptual-level processing? magnitude transduction detection spatial discrimination

A dermatome represents the motor innervation of muscles in that area. True False

What motor structure inhibits the motor cortex at rest? cerebellum brain stem motor nuclei basal nuclei precommand area

Which of the following cranial nerves carries only motor information? abducens olfactory optic trigeminal

Which connective tissue layer directly surrounds every axon in a nerve? endomysium perineurium endoneurium epineurium

Which cranial nerve innervates most of the visceral organs? accessory vagus abducens hypoglossal

Which pair below is incorrect? cranial nerve III: pupillary constriction cranial nerve IV: sensory cranial nerve VI: eye movement cranial nerve III: oculomotor nerve optic nerve: sensory

Which of the following carries no sensory information? trigeminal nerve vestibulocochlear nerve hypoglossal nerve optic nerve

Which of the following is NOT correct concerning nerves? Nerves are collection of axons of either sensory or motor neurons but not both. Nerves do not contain cell bodies. Nerves are analogous to tracts in the CNS. Nerves are covered by an outer sheath called the epineurium.

Which cranial nerve transmits information about audition? optic vestibulocochlear vagus abducens

Which of the following is NOT required for a reflex arc? motor neurons sensory neurons interneurons receptors

Which reflex has a contralateral component? flexor tendon crossed-extensor stretch

Which of these receptor types functions as an exteroceptor? hair follicle receptors Lamellar (Pacinian) corpuscles Tactile (Merkel) discs All of the listed responses are correct

Which of the receptor types contributes to the sense of touch by responding to light pressure? free nerve endings of sensory neurons muscle spindles Lamellar (Pacinian) corpuscles Tactile (Merkel) discs

Stretch reflexes can cause reciprocal inhibition because the sensory neuron synapses on the alpha motor neurons of both agonists and antagonists. True False

Which of the receptor types might function as a nociceptor? free nerve endings of sensory neurons

The synapse between which of the following two neurons is a part of a monosynaptic reflex arc?

When removing a hot sheet of cookies from the oven, you feel heat coming through the pot holder. What mechanism momentarily overrides your reflexive action to immediately drop the hot cookie sheet? modification of outgoing efferent signals by spinal cord gray matter interneurons temporary suppression of sensory input to the spinal reflex center intervention by the limbic system to inhibit the fear of being burned modulation of descending motor pathways by brainstem and cortex