PHYL 3520 Lecture Notes - Lecture 14: Resting Potential, Gap Junction, T Wave
9 Mar 2020
School
Department
Course
Professor
Document Summary
Phyl 3520 lecture 14 february 14, 2020 cv v: dysrhythmia iii. An ecg signal does not look like an action potential. To get current flow, there requires a difference in potential: a positive deflection is present in the ecg when arrows are pointed towards the + electrode. When we are looking at ecg, we are looking at the direction of movement of positive ions inside the cell. The wave of depolarization causes positive ions to move into the cell. Where is used to be positive outside the cell is now negative. The positive ions are moving towards the recording positive electrode and away from the negative electrode, resulting in a positive deflection: complete depolarization causes the cell to be completely positive inside and negative outside. Therefore, we have gone back to the flat segment after positive deflection: repolarization occurs so the arrows are pointed towards the electrode. There is a positive deflection despite the arrows going the opposite way.
