The Senses: Olfactory&Touch Flashcards

1
Q

What receptor is vision linked to

A

Photoreceptors

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2
Q

What do photoreceptors detect

A

Light wave

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3
Q

What receptor is linked to touch hearing and balance

A

Mechanoreceptors

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4
Q

What do mechanoreceptors detect

A

Sound waves
Pressure on skin and ear

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5
Q

What do chemoreceptors detect

A

Molecules in food and the air

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6
Q

The 2 chemical senses

A

Gustation and olfaction

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7
Q

Gustation

A

Taste

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8
Q

Olfaction

A

Smell

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9
Q

How does the olfactory epithelium work

A

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

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10
Q

How are odourants never trapped in the nasal cavity

A

Mucus flows constantly
Replaced every 10mins

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11
Q

Basal cells

A

Source of new olfactory cells

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12
Q

How many olfactory bulbs are there

A

2
Left and right

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13
Q

Where are the olfactory bulbs located

A

Above cribriform plate in forebrain

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14
Q

What is a glomerulus

A

Point of contact between 2 olfactory neurones

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15
Q

Olfactory transduction

A

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

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16
Q

How many zones is the epithelium split into

A

4

17
Q

What is meant by population coding

A

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

18
Q

What is meant by temporal coding

A

Timining of action potential is a code for particular odours

19
Q

What is meant by olfactory maps

A

Neurone in specific place respond to different odours