Studied by 1 person
what do sensory receptors convert
convert stimulus they detect into a nerve impulse
what are transducers
convert a stimulus into a nerve impulse (generator potential)
what are two features of sensory receptors
specific to single type of stimulus
act as transducer
what are four types of sensory receptors and what are their stimuli
mechanoreceptors (pressure and movement)
chemoreceptor (chemicals)
thermoreceptor (heat)
photoreceptors (light)
where are pacinian corpuscles located
deep within skin and most abundant in fingers and soles of feet
what type of sensory receptor are pacinian corpuscles
mechanoreceptors
where is the end of the sensory neurone in a pacinian corpuscle
within the centre of the corpuscle
what surrounds the end of the sensory neurone in a pacinian corpuscle
layers of connective tissue, each layer separated by a layer of gel
what is a stretch-mediated sodium channel
a special type of sodium channel that when shape is changed, permeability to sodium increases
what is the resting state in a pacinian corpuscle
stretch-mediated sodium ion channels are closed - has a resting potential
what does it mean when a membrane is depolarised
inside of cell becomes less positive due to influx of positive sodium ions - result in generator potential
what is a generator potential
local change in the membrane potential of a sensory receptor
what does a generator potential do
created an action potential if threshold is passed (-55mV)
where will the action potential be transmitted from a pacinian corpuscle
transmitted along neurone to CNS
Note 
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