Test 2 (Sensory Physiology) Flashcards
Specialized ending of an afferent neuron
Separate cell closely associated with the peripheral end of neuron
Receptor
What produces receptor potential
Change in membrane permeabilit and an influx of Na+
Concious interpretation of external world derived from sensory input
perception
Why does sensory input not give true reality perception?
Humans
visible wavelengths of light
photoreceptors
mechanical energy
mechanoreceptors
temperature change
thermoreceptors
solute concentration
osmoreceptors
specific chemicals
chemoreceptors
pain
nociceptors
body position
propioceptors
continues to poduce action potentials for the duration of the stimulus and does not adapt very well
tonic receptors
important to signal a change in stimulus intensity, rather than relay status quo
phasic receptors
things in our environment that are registered by the 5 major sensory organs
sensation
how we interpret sensation
perception
4 steps to perception
stimulus
transduction
conduction
perception
changing stimulus into nerve impulses
transduction
where are the senses of touch, pressure, cold and pain sent to?
somatosensory cortex
meissner’s corpuscles
stacks of flattened discs just deep to epidermis
onion-like capsule deep in skin
pacinian
what are the 5 primary tastes
salty sour sweet bitter umani
senses position of head, maintaining posture and position when the head and body are still
static equilibrium
fibrous, outermost layer of eye
sclera
transparent, anterior surface of the eye
cornea
brownish layer deep to the sclera
choroid
supports the lens, secretes aqueous humor
ciliary body
contains photoreceptors
inner layer
filled with aqueous humor which carries nutrients to the cornea and lens
anterior cavity
filled with vitreous body which maintains the shape of the eyeball
posterior cavity
