1.5 PHYSIOLOGY - Sensory

Question 1

Potential in triggering a sensory receptor

Answer 1

Generator Potential / Receptor Potential

Question 2

Generator potentials trigger

Answer 2

Action potential trains

Question 3

3 Characteristics of Sensory receptors. Define each.

Answer 3

1. Differential Sensitivity - “specific sensations, specific receptors”
2. Labeled Line Principle - “specific sensations, specific pathways”
3. Adaptation - change in a way the receptor responds to sequential or prolonged stimulation

Question 4

2 Types of adaptation

Answer 4

1. Slowly adapting receptors

2. Rapidly adapting receptors

Question 5

Slowly adapting receptors

Answer 5

TONIC receptor

continuous stimulus strength (detects steady stimulus)

Question 6

Examples of slowly adapting receptors

Answer 6

Muscle spindle, Golgi Tendon, Slow pain, Baroreceptor, Chemoreceptor

Question 7

Rapidly adapting receptors

Answer 7

PHASIC receptor ("Mabilis magsawa")
for detecting change in stimulus strength
detects onset and offset of stimulus
Predictive function

Question 8

Examples of rapidly adapting receptors

Answer 8

Pacinian corpuscle

Question 9

Region of the skin where stimuli can change the firing rate of the sensory neurons

Answer 9

Receptive Field

Question 10

2 types of Receptive Field

Answer 10

Type 1 - smaller RF with well-defined border

Type 2 - wider RF with poorly-defined border

Question 11

Non-hairy skin

Answer 11

Glabrous skin

Question 12

Iggo Dome receptors

Answer 12

Merkel’s Disc

Question 13

Onion-like structure

Answer 13

Pacinian Corpuscles

Question 14

Sensory encoded of free nerve endings

Answer 14

Touch and temperature

Question 15

tactile receptor in glabrous skin (esp fingertips and lips)

Answer 15

Meissner’s corpuscles

Question 16

Tactile receptor for continuous touch, localizing touch sensation and determine texture

Answer 16

Merkel’s disc

Question 17

Detects high frequency vibration

Answer 17

Pacinian Corpuscles

Question 18

Receptor located in deep skin, internal tissues, and joint capsules. Multi-branched, encapsulated, and slowly-adapting

Answer 18

Ruffini’s end organs

Question 19

Encodes movement of objects and low frequency vibrations

Answer 19

Meissner’s corpuscle

Question 20

Identify the type of receptor and receptive field.

Meissner’s Corpuscle

Answer 20

FA1

Question 21

Identify the type of receptor and receptive field.

Merkel’s Disc

Answer 21

SA1

Question 22

Identify the type of receptor and receptive field.

Ruffini’s end organs

Answer 22

SA2

Question 23

Identify the type of receptor and receptive field.

Pacinian Corpuscles

Answer 23

FA2

Question 24

Identify the first-4th order neuron in the sensory pathways

Answer 24

Sensory receptors
1st order: Cell body: dorsal Root or Cranial Nerve Ganglia
2nd order: spinal cord or brainstem
3rd: thalamus
4th: sensory cortex