__________ is the neurotransmitter released by the taste receptor cells.
A. GABA
B. Glycine
C. Dopamine
D. ATP
Is it A?
ATP is the energy source for all cells, so that answer is ruled out. C is also ruled out because although it is a neurotransmitter, it is activated to usually cause an emotional response; Glycine is one of the simple amino acids that doesn't act on taste buds -- as far as I know. This leaves answer choice A as the correct answer choice.
No, the correct answer is D. ATP.
To arrive at this answer, let's break down the question and its choices. The question asks about the neurotransmitter released by taste receptor cells.
To find the answer, we need to understand the function and process of taste perception. Taste receptor cells are located in taste buds on the tongue and transmit signals to the brain, enabling us to perceive taste. These cells release neurotransmitters to communicate with other cells, allowing the signal to be transmitted.
Now, let's review the choices:
A. GABA: GABA (gamma-aminobutyric acid) is a neurotransmitter in the brain that primarily inhibits neuronal activity. It is not associated with taste perception.
B. Glycine: Glycine is another inhibitory neurotransmitter in the central nervous system and spinal cord. It is not involved in taste perception.
C. Dopamine: Dopamine is a neurotransmitter associated with reward, motivation, and pleasure. While it plays a role in the brain's reward system, it is not directly related to taste perception.
D. ATP: ATP (adenosine triphosphate) is a molecule involved in energy transfer within cells. In the context of taste receptors, ATP is released and acts as a neurotransmitter, stimulating other cells to send taste signals to the brain. Thus, choice D is the correct answer.
Therefore, the correct answer is D. ATP.