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nmdcat.online July 7, 2026

The detection of sweet, bitter, and umami tastes relies on a transduction mechanism involving

A. Direct passage of ions through the membrane
B. G-protein coupled receptors and second messengers
✓
C. Mechanically-gated ion channels
D. Voltage-gated chloride channels

📝 Explanation

Sweet, bitter, and umami tastants bind to specific G-protein coupled receptors (GPCRs), activating secondary messenger cascades (like IP3/DAG) that eventually lead to cell depolarization. Salty and sour use direct ion channels.

📖 Additional Information

  • Direct passage of ions through the membrane
  • G-protein coupled receptors and second messengers
  • Mechanically-gated ion channels
  • Voltage-gated chloride channels

Sweet, bitter, and umami tastants bind to specific G-protein coupled receptors (GPCRs), activating secondary messenger cascades (like IP3/DAG) that eventually lead to cell depolarization. Salty and sour use direct ion channels.

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