Sense Of Taste (Gustation)
What is the life span of a receptor cell?
10 days
How many taste cells does a single taste bud have?
50-100
How many sensory receptors are in a taste bud?
50-150
What is a taste cell?
A gustatory receptor.
Filiform
All over the tongue but do not function in taste.
Circumvallate
At the back of the tongue.
What is Machado- Joseph's disease?
Ataxia of papillae.
What type of receptors are taste receptors?
Chemical
What are tastants?
Chemicals that stimulate gustatory receptors.
What is the sensitive part of the taste cell?
Gustatory hairs.
Where is the site of taste transduction?
Gustatory hairs.
Where are taste receptors located?
In the taste buds.
What has to happen for a chemical to be tasted?
It must be dissolved in saliva.
Where does the nerve impulses go from the medulla?
It propagates to the limbic system, thalamus, and hypothalamus.
Foliate
Lateral margins that go away at early childhood.
What is a gustatory receptor made of?
Modified epithelial cells.
Fungiform
Mushroom shaped, all over the whole tongue.
Where are taste buds located?
On the surface of the tongue.
What are papillae?
Raised protrusions on the tongue surface that taste buds sit on.
What tastes use chemically chemically gated channels?
Salt and sour.
List all 5 of the taste sensations.
Sour, Sweet, Salty, Bitter, and Umami.
What do the supporting cells do?
Surround the gustatory receptor cells.
What taste use activation of secondary messengers?
Sweet, Bitter and Umami.
What contains the receptor for taste?
Taste buds.
What happens when receptors cells are activated?
The cell releases neurotransmitters and their is an increase in intracellular Ca2+ channels.
What projects though the taste pore to the external surface?
The gustatory hairs (microvilli).
What happens after the nerve impulse propagates the cranial nerves?
The impulse is propagated to the gustatory nuclear in the medulla oblongata.
What is gustation?
The sense of taste.
What is the organ of taste?
The taste bud.
What part of the brain sends signals to the primary gustatory area of the cerebral cortex?
The thalamus.
What are basal cells?
They are stem cells that produce supporting cells which will eventually develop into gustatory receptor cells.
What happens when tastants dissolve in salvia
They make contact with the plasma membrane of the gustatory hairs.
What cranial nerves does the gustatory pathway involved?
VII (7) IX (9) and X (10); 7 = facial 10 = vagus 9 = glossopharyngeal
What is Behcet's disease?
Vascularitis of papillae.
Do taste buds decrease with age?
Yes, we start with about 10,000 that decrease in number with age.