Sensory receptors

Question 1

Prorioceptor

Answer 1

Mechanoreceptor of joints and muscle

Question 2

Nociceptor

Answer 2

pain and do not adapt

Question 3

Adequate stimulus

Answer 3

Activates stretch sensitive ion channels

Question 4

Adaption

Answer 4

Mechanoreceptors can adapt to maintained stimulus and only signal change - onset of stimulation

Question 5

Pacinian corpuscle

Answer 5

Rapidly adapting

Myelinated with naked nerve ending enclosed by connective tissue

Question 6

Deformed capsule

Answer 6

Open stretch sensitive channels
Sodium influx => depolarisation => AP
Essential non neural structure

Question 7

Receptive fields

Answer 7

Activate somatic sensory neuron by stimulus in specific area
Large = less sensitive eg back and limbs
Sensitive are lips and fingertips

Question 8

Acuity

Answer 8

Ability to locate stimulus on skin and differentiate from one close by

Question 9

Lateral inhibition

Answer 9

Information at edge of stimulus inhibited compared to centre to clean up information and allow a precise location

Question 10

Proprioceptors

Answer 10

Mechanoreceptors signalling body position

Question 11

Muscle spindles

Answer 11

Monitor muscle length

Question 12

Golgi tendons

Answer 12

Monitor tension on tendons

Question 13

Joint receptor

Answer 13

Monitor joint angle

Question 14

Intrafusal fibres

Answer 14

Form muscle spindles and muscle fibres lie parallel

Question 15

Gamma motor

Answer 15

Intrafusal - contraction at both ends

Question 16

Alpha motor

Answer 16

Extrafusal

Question 17

2 intrafusal fibres

Answer 17

Nuclear bag and nuclear chain

Question 18

Extrafusal fibres

Answer 18

Muscle spindles parallel

GTO in series

Question 19

Gamma not present

Answer 19

Floppy and spindle discharges and contract with alpha to ensure no drop off in 1a

Question 20

alpha gamma co-activation

Answer 20

Restore tension and reset sensitivity for normal movements