MEDICAL
HEART AND PERICARDIUM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Which of the following statements correctly describes what occurs as a result of the depolarization that accompanies the P wave?
|
|
The ventricles return to the resting state.
|
|
|
The atria return to the resting state.
|
|
|
The impulse spreads to the ventricles, triggering ventricular contractions.
|
|
|
The impulse spreads across the atria, triggering atrial contractions.
|
Explanation:
Detailed explanation-1: -Depolarization of a cardiac muscle cell occurs as the result of: the rapid movement of ions across the cell membrane. Depolarization is caused by the movement of electrically charged solutes (ions) across cardiac cell membranes.
Detailed explanation-2: -Depolarization of cardiac muscle occurs when Na+ ions diffuse into the cell as voltage-gated Na+ ion channels open. Early repolarization of cardiac muscle cells occurs when voltage-gated Na+ ion channels close and voltage-gated K+ ion channels open.
There is 1 question to complete.