0
Depolarization is the process where the membrane potential becomes less negative, moving towards zero or even becoming positive. This occurs when sodium ions rush into the cell. Repolarization is the return of the membrane potential back to its resting state, following depolarization, usually through the efflux of potassium ions from the cell.
Add your answer:
Earn +20 pts
B What are the major events of an action potential and what ion changes are associated with each event?
During an action potential, the major events include depolarization (sodium channels open, sodium ions enter the cell), repolarization (potassium channels open, potassium ions leave the cell), and hyperpolarization (potassium channels close slowly leading to an overshoot of the resting membrane potential). Sodium influx causes depolarization, while potassium efflux causes repolarization and hyperpolarization.
What describes when the myocardial cells recovers electrically?
The process by which myocardial cells recover electrically after depolarization is called repolarization. During repolarization, the cell's membrane potential returns to its resting state as potassium ions exit the cell. This phase prepares the myocardial cells for the next electrical impulse.
What is the duration of action potential of skeletal muscle?
The duration of action potential in skeletal muscle is typically around 2-4 milliseconds. This includes the depolarization phase (around 1-2 milliseconds) and repolarization phase (around 1-2 milliseconds).
What is the ECG of a normal human?
A normal ECG of a human will show a P wave, QRS complex, and T wave. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. These waves correspond to the electrical activity of the heart during each phase of the cardiac cycle.
What does the sodium-potassium exchange pump transfer into and out of the cell during depolarization?
The sodium-potassium exchange pump transfers 3 sodium ions out of the cell and 2 potassium ions into the cell during depolarization. This process helps in maintaining the electrochemical gradient across the cell membrane and is crucial for cell function.
The process of depolarization and repolarization is called?
The process of depolarization and repolarization is called an action potential. During depolarization, the cell's membrane potential becomes more positive, while during repolarization, the membrane potential returns to its resting state.
What is the stage in an action potential that immediately follow depolarisation?
The stage that immediately follows depolarization in an action potential is repolarization. During repolarization, potassium ions move out of the cell, causing the membrane potential to return to its resting state.
The stage in an action potential that immediately follows depolarization is?
The stage that immediately follows depolarization in an action potential is repolarization. During this stage, potassium channels open and potassium ions move out of the cell, leading to a restoration of the cell's negative charge.
What channels are open during depolarization and during repolarization?
During depolarization Na channels are open During repolarization K channels are open
What is atrial repolarization indicated by?
The atrial repolarization occurs during the QRS complex of the ECG but is obscured by the ventricle depolarization.
Arrange these action potential events in their proper sequence?
The correct sequence of action potential events is: 1. Resting membrane potential, 2. Depolarization, 3. Repolarization, 4. Hyperpolarization.
What is The depolarization and repolarization of a neuron membrane called?
This process is called nerve conduction.
What event follow the depolarization of neuron?
Repolarization is after depolarization. It descends to a region of hyper polarization where it is more polar than resting membrane potential
The QRS complex in an electrocardiogram results from?
An Electrocardiogram of a single heart beat shows three distinct waves. These are the P, QRS and T Waves. The QRS wave (normally the largest spike) in the electrocardiogram, is that of the ventricles depolarizing and contracting.
The T wave in a electrocardiogram results from?
Repolarization of ventricular muscle fibers.
Which electrolyte flows into the cell to initiate depolarization?
Sodium (Na+) is the electrolyte that flows into the cell to initiate depolarization during an action potential. This influx of sodium ions changes the membrane potential, leading to the generation of an action potential.
Does the p wave in an ekg indicate atrial depolarization?
No it does not. Atrial repolarization is generally not visible on the telemetry strip because it happens at the same time as ventricular depolarization (QRS complex). The P wave represents atrial DEpolarization (and atrial systole). Atrial repolarization happens during atrial diastole (and ventricular systole).
