05a: Sensory Receptor Physiology Flashcards Preview

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Flashcards in 05a: Sensory Receptor Physiology Deck (24):
1

Explain basic concept of "signal transduction"

Specialized nerve cell (receptor) absorbs particular kind of E and converts it to neural signal

2

T/F: Each sensory receptor responds readily to only one form of E.

True

3

The adequate stimulus for an olfactory receptor is:

odorant molecule

4

T/F: The adequate stimulus is the only form of stimulus that a receptor will respond to.

False

5

The sensation evoked in receptor is (the same/different) if different stimuli evoke the sensation.

The same

6

List the three major categories of receptors (based on adequate stimulus).

1. Mechanoreceptors
2. Chemoreceptors
3. Radiant E receptors
4. Nociceptors

7

Auditory and vestibular receptors are (mechano/chemo/radiant E) receptors.

Mechanoreceptors

8

Olfactory receptors are (mechano/chemo/radiant E) receptors.

Chemoreceptors

9

Gustatory receptors are (mechano/chemo/radiant E) receptors.

Chemoreceptors

10

Proprioceptors are (mechano/chemo/radiant E) receptors.

Mechnoreceptors

11

Light receptors are (mechano/chemo/radiant E) receptors.

Radiant E receptors

12

Cold/warmth receptors are (mechano/chemo/radiant E) receptors.

Radiant E receptors

13

The simplest receptors are those for (X), which terminate in tissues with which specialization of receptor endings?

X = pain/T

Free nerve endings

14

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

15

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

16

Slowly adapting receptor.

Tonic receptor

17

Quickly adapting receptor.

Phasic receptor

18

Pacinian corpuscles are (tonic/phasic) receptors.

Phasic

19

In phasic receptors, firing frequency is proportional to:

Rate of change of stimulus

20

Along with range fractionation, what's the second mechanism used by receptor systems to (X).

X = broaden range of stimulus strength they can signal

Receptor adaption

21

List the mechanisms responsible for adaptation of receptor potentials. Give example of each.

1. Accessory structures (pacinian corpuscle)
2. Level of secondary messengers (photoreceptors)

22

Impulse Frequency proportional to (X) because both are also proportional to (Y).

X = stimulus intensity;
Y = generator potential amplitude

23

The (X) in sensory receptor is analogous to EPSP of synapse.

X = receptor/generator potential

24

List steps to sensory transduction.

1. Stimulus causes local change in permeability
2. Generator current
3. Local depolarization (generator potential)
4. Action potential
5. Adaptation