Which of these conditions occur in the cardiac muscle cell during the plateau phase?
a. voltage-gated Ca2+ ion channels are open
b. voltage-gated K+ ion channels are open
c. voltage-gated Na+ ion channels are closed
d. all of these
Answer: D
Which of these conditions occur in the cardiac muscle cell during the plateau phase?
a. voltage-gated Ca2+ ion channels are open
b. voltage-gated K+ ion channels are open
c. voltage-gated Na+ ion channels are closed
d. all of these