Question

question 9
1 pts
question: what is the primary function of g - protein - coupled receptors in neurotransmission?
directly opening ion channels
activating second messenger systems
transporting neurotransmitters
degrading neurotransmitters

Explanation:

G - protein - coupled receptors (GPCRs) do not directly open ion channels (that's more typical of ligand - gated ion channels). They don't transport or degrade neurotransmitters. Their main role in neurotransmission is to activate second messenger systems. When a neurotransmitter binds to a GPCR, it activates a G - protein, which then initiates a cascade that involves second messengers (like cAMP, IP₃, etc.) to transmit the signal inside the cell.

Answer:

B. Activating second messenger systems