Which of the following receptor types is associated with the most rapid response time?
(A) G-protein-coupled receptors (e.g., muscarinic receptors)
(B) ion channel receptors (e.g., nicotinic receptors)
© Jak-STAT receptors (e.g., for cytokines)
(D) steroid receptors (e.g., for corticosteroids)
(E) transmembrane enzyme receptors (e.g., for insulin)
Ans:
(B) Response times for ion channel receptors are measured in milliseconds, for G proteincoupled receptors (choice A), transmembrane enzyme receptors (choice E), and Jak-STAT receptors (choice C) in seconds to minutes, and for steroid receptors (choice D) in hours or days.