Flashcards in 05a: Sensory Receptor Physiology Deck (24):
Explain basic concept of "signal transduction"
Specialized nerve cell (receptor) absorbs particular kind of E and converts it to neural signal
T/F: Each sensory receptor responds readily to only one form of E.
The adequate stimulus for an olfactory receptor is:
T/F: The adequate stimulus is the only form of stimulus that a receptor will respond to.
The sensation evoked in receptor is (the same/different) if different stimuli evoke the sensation.
List the three major categories of receptors (based on adequate stimulus).
3. Radiant E receptors
Auditory and vestibular receptors are (mechano/chemo/radiant E) receptors.
Olfactory receptors are (mechano/chemo/radiant E) receptors.
Gustatory receptors are (mechano/chemo/radiant E) receptors.
Proprioceptors are (mechano/chemo/radiant E) receptors.
Light receptors are (mechano/chemo/radiant E) receptors.
Radiant E receptors
Cold/warmth receptors are (mechano/chemo/radiant E) receptors.
Radiant E receptors
The simplest receptors are those for (X), which terminate in tissues with which specialization of receptor endings?
X = pain/T
Free nerve endings
Range fractionation refers to the phenomenon where as one receptor (X), another receptor (Y). This allows for impressive (Z) of many receptor systems.
X = reaches maximum frequency
Y = is just reaching threshold
Z = dynamic range
The intensity of a stimulus is coded in which characteristic(s) of sensory system?
1. Frequency of firing of one sensory fiber AND
2. Number of activated fibers
Slowly adapting receptor.
Quickly adapting receptor.
Pacinian corpuscles are (tonic/phasic) receptors.
In phasic receptors, firing frequency is proportional to:
Rate of change of stimulus
Along with range fractionation, what's the second mechanism used by receptor systems to (X).
X = broaden range of stimulus strength they can signal
List the mechanisms responsible for adaptation of receptor potentials. Give example of each.
1. Accessory structures (pacinian corpuscle)
2. Level of secondary messengers (photoreceptors)
Impulse Frequency proportional to (X) because both are also proportional to (Y).
X = stimulus intensity;
Y = generator potential amplitude
The (X) in sensory receptor is analogous to EPSP of synapse.
X = receptor/generator potential