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19 Cards in this Set
- Front
- Back
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What is sensation?
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Sensation is a conscious or unconscious awareness of external or internal stimuli.
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Is sensation different from perception?
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yes perception is the conscious awareness and interpretation of a sensation. Sensation is any stimuli the body is aware of .
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What are we not aware of?
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x-rays, ultra high frequency sound waves, UV light
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Sensory Modalities are:
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theproperty by which one sensation is distinguished from another.
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What are the different types of sensations
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pain, touch, temp, vibration , hearing, vision,
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What are the classes of sensory modalities?
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General senses and special senses.
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What do the general senses include?
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They include both soomatic and visceral senses, which provide info about conditions within internal organs.
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What do the special senses include?
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The special senses include the modalities of smell, taste, vision, hearing and equilibrium.
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Sensory receptors demonstrate selectivity
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respond to only one type of stimuli
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What are the events occuring within a sensation?
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1)stimulation of the receptor
2)transduction (conversion) of stimulus into a graded potential 3)generation of impulses when graded potential reaches threshol 4) integration of sensory input by the CNS. |
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STRUCTURAL CLASSIFICATION OF RECEPTORS
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FREE NERVE ENDINGS , ENCAPSULATED NERVE ENDINGS, SEPARATE SENSORY CELLS
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DESCRIBE FREE NERVE ENDINGS
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BARE DENDRITES THAT DETECT PAIN, TEMP, TICKLY , ITCH AND LIGHT TOUCH
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DESCRIBE ENCAPSULATED NERVE ENDINGS.
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ENCAPSULATED NERVE ENDINGS ARE DENDRITES ENCLOSED IN CONNECTIVE TISSUE CAPSULE THAT DETECT PRESSURE, VIBRATION, AND DEEP TOUCH.
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SENSORY CELLS (SEPARATE)
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SPECIALIZED CLLS THAT RESPOND TO STIMULI OF VISION , TASTE, HEARING AND BALANCE.
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wHAT DO MECHANORECEPTORS DETECT?
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mECHANORECEPTORS DETECT PRESSURE OR STRETCH,
TOUCH, PRESSURE, VIBRATION, HEARING, PRPRIOCEPTION, EQUILIBRIUM, AND BLOOD PRESSURE. |
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wHAT DO ThERMORECEPTORS DETECT?
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TEMPERATURE
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WHAT DO NOCICEPTORS DETECT?
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DAMAGE TO TISSUES
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WHAT DO PHOTORECEPTORS DETECT
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LIGHT
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WHAT DO CHEMORECEPTORS DETECT?
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MOLECULES-TASTE, SMELL, AND CHANGES IN BODY FLUID CHEMISTRY
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