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Questions and Answers
What role does cAMP play in the olfactory process?
What role does cAMP play in the olfactory process?
- It mediates the opening of cation channels. (correct)
- It directly binds to odorants.
- It functions as an odorant receptor.
- It activates sodium-potassium pumps.
Which sequence accurately describes the activation of olfactory receptors?
Which sequence accurately describes the activation of olfactory receptors?
- Odorants bind → block cAMP → close cation channels
- Odorants are synthesized → bind to receptors → open Na+ channels
- Odorants bind → activate Golf → increase cAMP (correct)
- Odorants bind → activate Golf → decrease cAMP
What effect does the opening of cAMP-gated cation channels have on the olfactory cells?
What effect does the opening of cAMP-gated cation channels have on the olfactory cells?
- It hyperpolarizes the cell membrane.
- It triggers exocytosis of odorants.
- It initiates the synthesis of G-proteins.
- It depolarizes the cell membrane. (correct)
What initiates the signaling process in olfaction?
What initiates the signaling process in olfaction?
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What happens after the activation of Golf in olfactory cells?
What happens after the activation of Golf in olfactory cells?
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Study Notes
Olfaction Process
- Odorants interact with specialized odorant receptors, which are G-protein-coupled receptors on the cell membrane.
- Binding of odorants activates the G-protein called Golf.
- Activation of Golf leads to an increase in cyclic AMP (cAMP) levels within the cell.
- Elevated cAMP opens cation channels that are gated by cAMP, allowing positive ions to flow into the cell.
- The influx of positive ions causes depolarization of the olfactory receptor cell.
- Depolarization generates an electrical signal that travels along the axon to the olfactory bulb, indicating the presence of a scent.
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Description
Test your knowledge on the olfactory system, focusing on how odorants interact with receptors and the subsequent signaling processes. This quiz covers the mechanisms of odor detection and the role of cAMP in olfactory transduction.
