Answers A-D A Current from neighboring regions can trigger a second action potential in phase 2 B Inward current is carried by sodium ions in phase 0 C Phase 1 is caused by a rapid decrease in potassium currents D The potassium current is nearly equal to sodium current in phase 2

Answers A-D A Current from neighboring regions can trigger a second action potential in phase 2 B Inward current is carried by sodium ions in phase 0 C Phase 1 is caused by a rapid decrease in potassium currents D The potassium current is nearly equal to sodium current in phase 2

Cardiopulmonary Anatomy & Physiology

7th Edition

ISBN:9781337794909

Author:Des Jardins, Terry.

Publisher:Des Jardins, Terry.

Chapter12: Electrophysiology Of The Heart

Section: Chapter Questions

Problem 3RQ

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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

Which is TRUE of the fast action potential shown below?
4
0
Answers A-D
2
3
4

Answers A-D
A Current from neighboring regions can trigger a second action potential in phase 2
B Inward current is carried by sodium ions in phase 0
C Phase 1 is caused by a rapid decrease in potassium currents
D The potassium current is nearly equal to sodium current in phase 2

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