Question

Pacemaker cells have a unique set of channels that, unlike most voltage-gated ion channels, open when the membrane potential is at _____ values. these nonspecific cation channels conduct mainly an inward, depolarizing, na current and, because of their unusual gating behavior, have been termed _____ channels.

multiple choice question.
A. negative; t-type
B. positive; f-type
C. positive; t-type
D. neutral; f-type
E. neutral; t-type
F. negative; f-type

Answer 1

Pacemaker cells contain channels that open at negative values and these are known as funny channels or F-type channels, so the right answer is F. negative; f-type.

Step-by-step explanation:

Pacemaker cells in the heart have a unique set of channels that, unlike most voltage-gated ion channels, open when the membrane potential is at negative values. These channels are nonspecific cation channels that conduct mainly an inward, depolarizing Na+ current and, because of their unusual gating behavior, have been termed funny channels or F-type channels. Therefore, the correct answer to the question is F. negative; f-type.