Sensory Physiology Flashcards
The initial interaction of stimulus with receptor is ___________. This is the transformation of physical energy into a ______ ______.
Transduction; neuronal signal
What is an adequate stimulus?
Denotes the type of energy required to stimulate specific receptors
What is the receptive field?
Stimulation site(s) that elicit neural response
What types of senses use a receptor cell to communicate with the primary afferent neuron?
- Vision
- Audition
- Balance
- Taste
Which types of senses use molecular interaction with membrane proteins to push stimulus?
- Vision
- Taste
- Olfaction
Which sense uses both direct interaction and molecular interaction?
TASTE
How does Na play a factor in direct transduction of the taste system?
Stimulus opens ion channels -> Na enters -> AP leads to Ca entry -> ATP released as neurotransmitter
What types of direct transduction are utilized by mechanoreceptors?
Piezo 1 and Piezo 2
T/F: TRP is a type of direct transduction pathway.
TRUE
What types of G-protein systems are used by the various senses?
- Olfaction: Golf and Gs
- Vision: rhodopsin
- Taste: gustducin
What is the process for the “sweet” stimuli to get through the receptor cell?
Sugars bind to receptor coupled G-protein -> intracellular Ca release -> TRP channel activated -> release of ATP as neurotransmitter
What happens in the nerve when the stimulus intensity increases?
- Increase in receptor potential
2. Increase in the number of action potentials
How do some neurons have a finer sense of location than others?
By having a smaller receptive field
How does inhibition play a role in identifying the location of a stimulus?
If a high intensity stimulus is felt by a receptor, the nerve can inhibit the nerves near it to better pinpoint the location.
Is the olfactory system tuned to recognize specific stimulus?
Not necessarily. Brain must compare activity amongst all fibers creating many combinations of stimuli
