Answer and explain the following questions. 1. Choose all that are characteristic of pacemaker cells, but not contractile cells of the heart. 18 pts Membrane
Answer and explain the following questions. 1. Choose all that are characteristic of pacemaker cells, but not contractile cells of the heart. 18 pts
Membrane potential is unstable
Have a plethora of potassium channels
Control heart rate
Repolarization is prolonged due to calcium current
Potassium inﬂux repolarizes the cell
Have sodium action potentials 2. Match the description to the correct set of pacemakers. If the description does not ﬁt any: choose
“none." 12 pts Found in right atrium Connect atria to ventricles Depolarize the fastest Conduct the fastest IConduct the slowest Set heart rate about 50 bpm
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