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Flashcards in senses and perception Deck (72)
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1

a stimulus is converted to an electrical AP by which receptors?

specific sensory receptors

2

which pathways transmit sensory tactile information?

specific sensory pathways

3

which receptors respond to mechanical stimuli (touch)?

mechanoreceptors

4

which receptors respond to thermal stimuli (hot, cold)?

thermoreceptors

5

which receptors respond to noxious stimuli (pain)?

nociceptors

6

which receptors respond to chemical stimuli (taste, smell)?

chemoreceptors

7

which receptors respond to light stimuli (sight, vision)?

photoreceptors

8

which receptors respond to sound (hearing)?

mechanoreceptors

9

which receptors respond to limb position (spacial awareness)?

proprioreceptors

10

which receptors respond to blood pressure?

baroreceptors

11

what is a receptive field?

the distribution of sensory receptor nerve endings of a single neuron

12

give examples of areas of the body with small receptive fields

- tongue
- tips of fingers

13

give examples of areas of the body with large receptive fields

- shoulders

14

what is the relationship between size of receptor field and size of the area of therein designated to that part of the body?

areas with small overlapping receptor fields have larger regions of the brain (cortical representation)

15

define 2 point discrimination

ability to discern 2 separate mechanical stimuli

16

what is the relationship between the size of the 2 point discrimination and the size of the receptive field?

small 2 pt discrimination = area with small receptive fields = area with large cortical representation

17

when would someone perceive 2 points?

when stimuli is applied to 2 non overlapping receptor fields

18

if you activate 3 overlapping receptive fields, how many points will the individual perceive?

2

19

describe the transduction of stimuli to an electrical impulse

- stimulus
- change in receptor membrane permeability
- influx of cations
- depolarisation
- AP

20

how does the activation of a mechanoreceptor open an ion channel?

force applied to a receptor pulls cytoskeletal elements under the cell membrane opening channels

21

how does the activation of a chemoreceptor open an ion channel?

G protein cascade - binding of protein distant to receptor stimulates chain of events that open pore

22

how is the quality of the stimulus coded?

by type of receptor

23

how is the intensity of the stimulus coded?

- AP frequency
- number of activated neurons

24

in terms of measuring the duration of a stimulus, receptors can be classified into two groups, what are the?

- slowly adapting receptors
- rapidly adapting receptors

25

the distorted representation of proportion of the human brain dedicated to processing motor function is called?

sensory homunculus

26

what are receptors?

peripheral endings of sensory neurons

27

where are all sensory nerves collected?

dorsal root ganglion

28

give examples of cutaneous and subcutaneous mechanoreceptors and what they respond to

- meissners corpuscle (light touch)
- merkel disc (pressure)
- hair follicle receptor (hair deflection)
- pacinian corpuscle (vibration/pressure)
- muffins ending (pressure/hear)

29

where does the brachial plexus innervate?

- axillary (arm pit)
- musculocutaneous (bicep)
- radial (posterior upper limb)
- ulnar (elbow)
- median (upper arm)

30

bundles of axons are called what?

fascicle