Cardiac ________ channels are called hyperpolarization cyclic nucleotide (HCN)channels because they open in response to hyperpolarization.
A)atrial
B)Purkinje
C)pacemaker
D)ventricular

Question

Quizplus · Accepted Answer

HCN channels are also known as pacemaker channels because they play a role in setting the heart's pacemaker activity. They are specifically activated during diastolic depolarization, which occurs when the membrane potential becomes more negative, leading to the opening of HCN channels and the inflow of sodium and calcium ions, which depolarizes the membrane and initiates the next action potential. Therefore, option C is the best choice as it refers to pacemaker channels.

Cardiac ________ Channels Are Called Hyperpolarization Cyclic Nucleotide (HCN)channels Because