Sensory receptors (systems)

Question 1

Name 4 differnt types of neurones?

(Neuronal diversity)

Answer 1

• Anaxonic neurone
• Bipolar neurone
• Pseudounipolar neurone
• Multipolar neurone

Question 2

Describe anaxonic neurones

Answer 2

Have more than two processes, but axons cannot be distinguished from dendrites

Question 3

Describe bipolar neurones

Answer 3

Have two processes seperated by the cell body

Question 4

Describe pseudounipolar neurones

Answer 4

Have a single enlongate process w the cell body situated to one side

Question 5

Describe a multipolar neurone

Answer 5

Have more than 2 processes; there is a single axon & multiple dendrites

Question 6

What are Aδ (delta) fibres like?

Answer 6

They are fast, myelinated & carry info about sharp, well loaclised pain

They conduct impulses at the rate of approx 20m/s

Question 7

What are C-fibres like?

Answer 7

They are slower than Aδ (delta) fibres & unmyelinated and transmit dull aching pain i.e. diffusely localised

They conduct impulses at the rate of approx 1m/s

Question 8

What are nocieptors?

Answer 8

Pain receptors

Are rapidly adapting - sensitive to noxious or painful stimuli

Question 9

What are thermoreceptors?

Answer 9

Temperature receptors

Question 10

What do chemireceptors detect?

Answer 10

Respond to water-soluble & lipid-soluble substances dissolved in body fluids

Question 11

What sort of sensation do myelinated type A fibres carry?

Answer 11

Carry sensations of fast pain

Question 12

What type of sensation do unmyelinated C fibres carry?

Answer 12

Carry sensations of slow pain

Question 13

What do proprioreceptors do?

Answer 13

Monitor the positions of joints & muscles

Transmit sensory info from muscles, tendons & joints about the position of a body part - such as a limb in space

Question 14

What do baroreceptors do?

Answer 14

Detect pressure changes

Question 15

What do tactile receptors do?

Answer 15

Provide the sensations of touch, pressure & vibration

Question 16

What are exteroceptors?

Answer 16

Are close to the body surface

Question 17

What are the 2 types of exteroceptors?

Answer 17

• Teloreceptors
• Contact receptors

Question 18

What are telorecpetors?

Answer 18

Include receptors that respond to distant stimuli (such as light or sound)

Question 19

What are contact receptors?

Answer 19

Transmit tactile, pressure, pain or thermal stimuli

Question 20

What are interoceptors?

Answer 20

Detect sensory info concerning the status of the body’s internal environment:

e.g. stretch, blood pressure, pH, oxygen or CO2 conc & osmolarity

Question 21

What do mechanosensitive receptors?

Answer 21

Can detect pressure, membrane stretch & shear stress (e.g. blood flow)

Question 22

What can temperature-sensitive receptors detect?

Answer 22

Can detect cold, cool, warmth & painfully hot

Question 23

What are polymodal nociceptors?

Answer 23

On C-fibres which are sensitive to noxious stimuli that are mechanical, thermal or chemical in nature

Question 24

What is the receptor that detects chillis?

Answer 24

TRPV1

Question 25

What is the receptor that detects cinnamon & garlic?

Answer 25

TRPA1

Question 26

Which detector detects mint?

Answer 26

TRPM8

Question 27

What are the stages of a mechanoreceptor working?

Answer 27

1 - Mechanical forces (shear stress, compression etc)

2 - Tension detected by Piezo channels

3 - Cation influx

4 - Transmission of AP & activation of downstream signalling

Question 28

What are the 4 types of mechanosesnsory end organs found in the skin?

Answer 28

• Pacinia corpuscles
• Ruffni endings
• Meissner corpsucles
• Merkel’s discs

Question 29

Not finished - only up to slide 16

Answer 29

:)