Question 1
The end of the plateau phase of cardiac contractile cell action potentials is due to the ________ of Ca
2+ channels and ________ of K
+ channels.
◦ closing, opening
◦ opening, opening
◦ closing, closing
◦ opening, closing
Question 2
A typical action potential of a myocardial contractile cell lasts ________ millisecond(s).
◦ at least 200
◦ 1-5
◦ 50-100
◦ at least 500
◦ less than 1