The Senses: Olfactory&Touch

Question 1

What receptor is vision linked to

Answer 1

Photoreceptors

Question 2

What do photoreceptors detect

Answer 2

Light wave

Question 3

What receptor is linked to touch hearing and balance

Answer 3

Mechanoreceptors

Question 4

What do mechanoreceptors detect

Answer 4

Sound waves
Pressure on skin and ear

Question 5

What do chemoreceptors detect

Answer 5

Molecules in food and the air

Question 6

The 2 chemical senses

Answer 6

Gustation and olfaction

Question 7

Gustation

Answer 7

Taste

Question 8

Olfaction

Answer 8

Smell

Question 9

How does the olfactory epithelium work

Answer 9

When you sniff
Air enters the nasal cavity
Molecules get caught in mucus of olfactory epithelium
Bind to olfactory receptors

Question 10

How are odourants never trapped in the nasal cavity

Answer 10

Mucus flows constantly
Replaced every 10mins

Question 11

Basal cells

Answer 11

Source of new olfactory cells

Question 12

How many olfactory bulbs are there

Answer 12

2
Left and right

Question 13

Where are the olfactory bulbs located

Answer 13

Above cribriform plate in forebrain

Question 14

What is a glomerulus

Answer 14

Point of contact between 2 olfactory neurones

Question 15

Olfactory transduction

Answer 15

Odorant molecule bind to odorant receptor protein
G-protein stimulated
cAMP activated
cAMP bind to cyclic nucleotide gated cation channel
Channel open sodium and calcium influx
Calcium- activated chlorine channel open
Efflux of chlorine
Membrane depolarisation
Action potential generated
Odorant diffuses away

Question 16

How many zones is the epithelium split into

Answer 16

4

Question 17

What is meant by population coding

Answer 17

Each Oder is represented by the activity of a large population of neurones

Question 18

What is meant by temporal coding

Answer 18

Timining of action potential is a code for particular odours

Question 19

What is meant by olfactory maps

Answer 19

Neurone in specific place respond to different odours