Lecture 5 Block 3 Flashcards
what are special senses
in specialized sensory organ
what are special somatic senses
visual and auditory systems
what are special visceral senses
gustatory and olfactory
what are general senses
all over the whole body
what are examples of special senses
vision, hearing, taste, and smell
what are examples of general somatic senses
pain, temperature, touch, pressure, and body position
what are the 5 types of sensory transduction based of stimulus modalities
- chemo: tastings, olfactants, irritants
- photo: photons
- mechano: sounds, acceleration, vibration, pressure
- thermo: hot and cold temperatures
- Noci: a variety of strong noxious stimuli
what are sensory receptors
cells that convert sensory signals to electrochemical signals to be transmitted to the brain
what are the two types of sensory receptors
neurons and epithelial cells
what do neuronal receptors do
send axons to CNS or other peripheral neurons
what do epithelial sensory receptors do
synapse on sensory neurons which in turn sends axons to CNS
describe the stimulus induced change in the membrane potential of the sensory receptor cell
- can be depolarizing or hyperpolarizing
- it is graded and increases as stimulus becomes stronger
- can trigger transmitter release in some receptor cells, and trigger AP in other receptor cells
what type of receptor mediates salty taste
ENaC
what type of receptor mediates sour taste
H+ activated TRPP3 channel
what do both ENaC and H+ activated TRPP3 channels do
- activate ion channels
- depolarize the taste receptor cell, generating receptor potential
- activate Ca2+ channels
- release transmitter and activate nerve terminal
