The Senses: Olfactory&Touch Flashcards
What receptor is vision linked to
Photoreceptors
What do photoreceptors detect
Light wave
What receptor is linked to touch hearing and balance
Mechanoreceptors
What do mechanoreceptors detect
Sound waves
Pressure on skin and ear
What do chemoreceptors detect
Molecules in food and the air
The 2 chemical senses
Gustation and olfaction
Gustation
Taste
Olfaction
Smell
How does the olfactory epithelium work
When you sniff
Air enters the nasal cavity
Molecules get caught in mucus of olfactory epithelium
Bind to olfactory receptors
How are odourants never trapped in the nasal cavity
Mucus flows constantly
Replaced every 10mins
Basal cells
Source of new olfactory cells
How many olfactory bulbs are there
2
Left and right
Where are the olfactory bulbs located
Above cribriform plate in forebrain
What is a glomerulus
Point of contact between 2 olfactory neurones
Olfactory transduction
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