Sensory systems: chemical senses

11 important questions on Sensory systems: chemical senses

Where are the olfactory sensory neurons located?

At the roof of the nasal cavity, embedded in the mucus

What is the function of the epithelial cells in-between the olfactory neurons

Support, producing mucus, recycling and regeneration of olfactory neurons

What happens upon the binding of odor?

Activation of Golf --> bind GTP and becomes active --> activation of adenylate cyclase --> ATP is converted into cAMP --> open Ca2+ and Na+ channels --> influx of Ca2+ and Na+ --> depolarization --> AP generation
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What do glomeruli consist of in the olfactory bulb

Olfactory neurons terminals and mitral cells

Which cell can inhibit the mitral cell and how do they do this

The granule cells, they release GABA

The olfactory tract can end up in 3 places, name them

Piriform cortex, Amygdala, entorhinal cortex

What happens when we taste sweet, bitter, and umami

Glucose binds to GCPR --> transducer is activated --> phospholipase c activation --> break down of PIP2 into DAG and IP3 --> IP3 activates the release of Ca2+ by ER --> release of NT

What happens when we taste salt?

Na+ channels and Ca2+ channels are always open --> Na+ enters the cell --> influx of both Na+ and Ca2+ --> neurotransmitter release

What happens when we taste sour?

H+ blocks the K+ channels, then K+ can't exciters the cell --> depolarization

Where to the facial nerve, glossopharyngeal and laryngeal nerve send taste information to

Nucleus of the solitary tract in the medulla

Do heat and capsaicin activate the same receptor

Yes

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