Facts about Taste receptor cells
- 09
Circumvallate taste receptor cells at the back of the tongue send signals through the glossopharyngeal nerve, the ninth cranial nerve, allowing detection of bitter and umami compounds in food.
- 08
Taste receptor cells in fungiform papillae on the anterior two-thirds of the tongue transmit signals through the chorda tympani branch of the facial nerve, the seventh cranial nerve.
- 07
Capsaicin, the compound that creates spicy sensations, binds to the TRPV1 ion channel on pain nerve fibers rather than true taste receptor cells, which is why spiciness registers as heat rather than taste.
- 06
Salty taste receptor cells detect sodium ions through the epithelial sodium channel ENaC, which directly allows sodium to enter the cell and trigger the taste signal.
- 05
Umami taste receptor cells express the metabotropic glutamate receptor mGluR4 and the heteromeric T1R1 and T1R3 proteins to detect savory amino acids like glutamate.
- 04
On the tongue's surface, bitter taste receptor cells express over 25 different TAS2R receptor types, enabling detection of diverse potentially toxic compounds.
- 03
Sweet taste receptor cells express the T1R2 and T1R3 proteins, which form a heterodimeric receptor complex that activates when sugar molecules bind.
- 02
Humans detect five basic tastes through approximately 10,000 taste buds, each containing 50 to 100 individual taste receptor cells.
- 01
Every 10 days, taste receptor cells completely regenerate, making them among the fastest renewing cells in the human body.