Flashcards in Receptors Deck (27):
what are receptors?
transducers that change physical and chemical stimuli into electrical nerve impulses
what is afferent (sensory) information used for?
sensation- conscious, must be perceived
control of movement (e.g. flexor reflex)
protection- pain, reflexes
for sensation you must have a ____?
sensory receptors go to ____?
what are the 4 receptor qualities?
receptors mediate 4 stimulus qualities that can be quantified
labeled line code- modality specific
frequency- increase # of receptors; threshold
temporal - how fast
spatial- how many
relationship between stimulus intensity and perceived intensity
discharge patterns of RA & SA
location of receptor, types of discharges
modalities and qualities of sensation depend on:
1: temporal and spatial patterns of activation
2: specificity of sensory endings
(lowest threshold for a receptor is the "novel stimulus" (i.e. lowest threshold for eye receptors is light))
3: central connections
(where it goes in the cerebral cortex determines the type of stimulus detected (a touch sensory put in the eye would sense touch as sight)???
(primary sensory cortices- go along with modalities; input goes to certain areas; central connections
what is the quality for the sensory modality vision?
what is the quality for the sensory modality hearing?
what is the quality for the sensory modality smell?
> 20 odors
what is the quality for the sensory modality taste?
"umami" (MSG, other amino acids)
what is the quality for the sensory modality somatic?
pain, itch, tickle
postion and movement senses
the greater the response the greater the stimulus
spike in AP
the more AP, the higher the intensity
Topographic (somatotopic) map
slide 7 of receptors????
primary sensory cortices to go with modalities. go to certain areas of cerebral cortex. this is what is meant by central connections
what are the 3 anatomic classifications of receptors?
what are exteroceptors?
located on external body surfaces
what are proprioceptors?
located in tendons, joints, ligaments, fascia
what are interoceptors?
what are the 6 physiologic classifications of receptors?
**based on novel stimulus
1: mechanoreceptors- physical or mechanical stimuli
2: thermoreceptors- temperature
3: photoreceptors- light
4: chemoreceptors- chemicals
5: pain receptors
6: nociceptors- damage (pain & damage info)
what is habitutation?
decrease in response to a constant/repeated stimulus
what is adaptation?
stops working because it is used to the response
will respond when you touch it and stops when you stop touching it; only sees change (when stimulus is turned on or off, not in between)
more time detection
will respond when you touch it and then there is a slow decay when you remove the stimulus