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mcb163 lec1 mltpl
compilation of multiple choice from lec exam1
| Question | Answer |
|---|---|
| axons | range in size from ~0.2-20 �m in diameter |
| The volume of extracellular space in the central nervous system is | <5% |
| The dorsal columns in the spinal cord | carry conscious information |
| Intensity coding in neurons is represented by | interspike interval |
| In the spinal cord, inhibitory synapses | mainly on neuronal cell bodies |
| A lemniscus | a decussated second-order sensory axon |
| Which of the following roles of glial cells? | buffering extracellular pH, myelination, response to injury |
| What are the functions of laminae VIII and IX in the spinal cord? | none of the above |
| Receptive fields for touch on the fingertips | have lower thresholds than those for pain and temperature |
| Spinothalamic tract neurons | have cell bodies mainly in laminae II-V |
| Tay-Sachs is a disease | that affects women primarily through paternal inheritance and causes autonomic dysfunction |
| The central gray | projects to both the hypothalamus and raphe nuclei for the analysis and control of pain, respectively |
| Pyramidal cells | are the main source of long-distance projections and of cortical output1. they usually have a large cell body, a myelinated axon, and use glutamate, aspartate, or acetylcholine as atransmitter; about 75% of cortical neurons fit this description |
| Dorsal root ganglion cells at spinal level C5 | none of the above... |
| shivering is a result of | posterior hypothalamus controls heat conservation |
| C fibers and their associated receptors | free nerve endings: dermal pain receptors innervated by ganglion cells |
| The central gray | participates in the descending control of nociception |
| The intermediolateral cell column contains | provides sympathetic innervationof the heart, and neurons from project to the middle cervical sympathetic ganglion |
| Ganglion cells | convert graded receptor potentials into synaptic potentials. |
| Transecting a single dorsal root | weakly affects sensation, altering cutaneous sensation more than pain and temperature. |
| Group A epsilon fibers are critical for | the thickest fibers represent large ganglion cell axons innervating rapidly-adapting corpuscular mechanoreceptors |
| In SI, information from slowly- and rapidly adapting mechanoreceptors | is segregated in alternating columns for parallel processing. |
| The cerebellum | influences spinal motoneurons through the reticulo- and vestibulospinal tracts. |
| The conduction velocity of the thinnest unmyelinated autonomic efferent axons is | .5-2 m/sec |
| The blood brain barrier | made up of astrocytes |
| Dendritic spines | no myelin, not presynaptic to inhibitory neurons, don't send all-or-nonr action potentials, and surely don't permit all presynaptic axons to fire tonically |
| Somatic sensory cortex | contains representations of the body surface;superimposed on these maps is a second layer of organization, in which alternating cortical columnscontain neurons tuned preferentially to slowly- or rapidly-adapting mechanoreceptor populations |
| Receptor (generator) potentials are | graded and proportional to stimulus intensity |
| Enkephalinergic interneurons in the dorsal horn | this presynaptic inhibition alters the perception of pain due to the central neural adjustments of set point |
| A slowly-adapting receptor | tonic output, duration-sensitive, static sensors |
| Axons | can be presynaptic and postsynaptic only to other neurons |
| Somatic sensory cortex | contains representations of the body surface |
| Glial cells | provide myelination, buffer extracellular pH, and remove damaged processes |
| Damage to the corticospinal pathway causes | deficits in the power and precision of muscular contractions |
| A pain receptor | c fibers-these axons arise from small dorsal root ganglion cells whose peripheral processes innervate freenerve endings that respond selectively to burning, grinding pain |
| Dendrites | conduct spikes decrementally and depend on spatial and temporal summation |
| Interneurons | (Golgi type II): usually inhibitory, project nearby and alter transmission in anucleus, often via an unmyelinated, slowly-conducting axon |
| Stimulating the corticospinal pathway causes | changes in the power and precision of the contractions of specific groups of striated muscle |
Created by:
greerbaby
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