Sensory Receptors

Question 1

sensory receptors

Answer 1

nerve endings with specializes non-neural structures

transducers that convert different forms of energy into frequency of Action potentials (APs)

Question 2

sensory modality

Answer 2

type of stimulus activating a particular receptor

pain
temperature
light
touch
pressure

Question 3

mechanoreceptors

Answer 3

stimulated by mechanical stimuli

Question 4

proprioceptors

Answer 4

mechanoreceptors in joints

signal information related to body or limb position

Question 5

nociceptors

Answer 5

respond to pain

Question 6

chemoreceptors

Answer 6

chemical changes

Question 7

transduction in ALL sensory receptors involves opening and closing of

Answer 7

ion channels

Question 8

graded membrane potential change is also called a

Answer 8

receptor potential

Question 9

stimulus in mechanoreceptors and proprioceptors is

Answer 9

membrane deformation

activated stretch sensitive ion channels causing ion flow across the membrane e

Question 10

A stimulus causes local current to flow to the part of the membrane with

Answer 10

voltage-gated ion channels

Question 11

the larger the stimulus the higher the frequency of

Answer 11

action potentials

Question 12

stimulus is enough to cause an above..

Answer 12

threshold generator potential

which triggers APs

Question 13

mechanoreceptors only signal the

Answer 13

ONSET of stimulus

Question 14

respond to a change or a novel event

Answer 14

mechanoreceptors

Question 15

receptors that DO NOT ADAPT

Answer 15

nocireceptors

Question 16

pacinian corpuscle

Answer 16

most understood mechanoreceptor

Question 17

how does the pacinian corpuscle respond?

Answer 17

1. mechanical stimulus DEFORMS capsule and nerve ending
2. this stretches the nerve ending and opens ion channels
3. Na+ influx - depolarisation
4. APs are fired at myelinated nerve

Question 18

receptive field

Answer 18

somatic sensory neuron is activated by stimuli in a specific area

Question 19

our ability to tell 2 points on the skin apart depends on….

Answer 19

receptive field size

neuronal convergence

Question 20

multiple presynaptic neurons input on a smaller number of post-synaptic neurons

Answer 20

convergence

Question 21

Acuity

Answer 21

the ability to locate a stimulus on the skin and differentiate it with another close by

Question 22

proprioceptors include…

Answer 22

muscle spindles

Golgi tendon organs

joint receptors

Question 23

intra and extrafusal muscle fibres form a

Answer 23

muscle spindle

Question 24

two types of intrafusal fibre

Answer 24

nuclear bag fibre

nuclear chain fibre

Question 25

muscle stretch stimulates

Answer 25

spindle stretch receptors

Question 26

during stretch an increase in frequency is proportional to

Answer 26

velocity of stretch

Question 27

stretching the agonist increases

Answer 27

spindle discharge

Question 28

shortening the agonist

Answer 28

reduced spindle discharge

Question 29

alpha motor neurons cause

Answer 29

extrafusal fibre contraction

Question 30

gamma motor neurons cause

Answer 30

intrafusal fibre ends to contract

Question 31

gamma motor neurones are activated to maintain

Answer 31

spindle sensitvity

Question 32

alpha motorneurones are activated causing

Answer 32

contraction