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OSSF Exam III Questions and Answers 2024/2025 $13.49   Add to cart

Exam (elaborations)

OSSF Exam III Questions and Answers 2024/2025

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what are the three main functions of the nervous system?  gather sensory input integration effects a motor output how does the nervous system gather sensory input?  by monitoring internal and external (environment) stimuli (changes) using billions of sensory receptors how does the ner...

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  • October 11, 2024
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  • 2024/2025
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2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!


OSSF Exam III Questions and Answers
2024/2025
what are the three main functions of the nervous system?

 gather sensory input
integration

effects a motor output




how does the nervous system gather sensory input?

 by monitoring internal and external (environment) stimuli (changes) using billions of
sensory receptors


how does the nervous system integrate input?

 processes and interprets sensory input and makes decisions about what should be
done


how does the nervous system effect.a motor output (response)?


 by activating muscles or glands


what is the afferent nervous system?

 part of peripheral system - input cells/sensory


what is the efferent nervous system?

 part of peripheral system - output cells/motor


what is the fundamental functional unit of the nervous system?



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,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 neuron (nerve cell)


how do neurons function?


 sends and receives information via electrochemical transmission


what is a nuclei?

 a collection of cell bodies located within the CNS


what is a ganglion?

 a collection of cell bodies located outside the CNS


what is a nerve?


 a group of fibers (axons) outside the CNS


what is a tract?

 a group of fibers inside the CNS


what is a funiculus?

 bundles of fiber tracts


what is gray matter?

 an area of unmyelinated neurons containing cell bodies, dendrites, and some axons
where synaptic contacts occur




what is white matter?


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,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 an area of myelinated fiber tracts in the CNS


what do exterorecptors sense?


 stimulation arising outside of the body (touch, pain, temperature)


what do interoceptors sense?

 stimulation arising inside the body (chemical messengers, stretching of tissue, and
internal temperature)


what do proprioreceptors sense?

 responds to internal stimuli, but located only in skeletal muscle, tendons, joints, and
ligaments as well as in connective tissue covering bones and muscles


what are the 5 main receptor types and their detected stimuli?

 mechanoreceptors (touch, pressure, vibrations)
thermoreceptors (temperature)

photoreceptors (light)

chemoreceptors (smell, taste, blood chemistry)

nociceptors (pain)




what are Aa afferent fibers?

 includes both 1a fibers from muscle spindles and 1b fibers for the golgi tendon organ
- types of proprioceptors
fastest, largest diameter




what are AB afferent fibers?

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, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 non-noxious mechanoreceptors


what are A- afferent fibers? (idk what that second symbol is)


 noxious mechanoreceptors for quick, intense pain


what are C fibers?

 classic pain receptors - deep pain, visceral aching pain
can also respond to other stimuli - cat response to petting

slowest, smallest diameter




what contributes to afferent input?

 spinal nerves via dorsal root ganglion (sensory)
cranial nerves (I, II, V, VII, VIII, IX, X) - some sensory, some motor, mixed




what are the efferent somatic outputs?

 upper motor neurons and lower motor neurons


what are upper motor neurons?


 motor cortex
brain stem

project to motor nuclei of brainstem or spinal cord - active voluntary movement in LMN




what are lower motor neurons?

 final common pathway
project to muscles

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