0
Rapid depolarization happens after the membrane threshold has been reached and Na+ ions start to flow into the cell. As more Na+ ions flood in the cell becomes more and more positive. This causes the voltage gated Na+ channels to open creating a flood of Na+ ions and thus a rapid phase of depolarization. Shortly after this rapid phase K+ ions are released from the cell causing the cell to become more negative closing the Na+ channels and thus repolarizing the cell.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What causes Local depolarization that leads to generate action potential?
Opening of sodium channels and the fact that potassium channels are still closed leads to rapid depolarization that may lead to the neuron firing.
What event follows after the depolarization of a neuron?
A rapid return to the neuron's resting state
How is the electricity in a action potential generated?
Generally speaking the neuron is becoming depolarized, but to be more specific Phases of Action Potential: 1. Resting Potential: Vm = -65mV 2. Rising Phase: Vm = 40mV; Rapid depolarization of the membrane. 3. Overshoot: When the inside of the neuron is positively charged with respect to the outside of the membrane. 4. Falling Phase: Rapid depolarization until the membrane in more negative than the resting potential (-65mV) a. The last part of the falling phase is called the undershoot, or after-hyperpolarization.
What is the condition of rapid and irregular or out of phase heart contractions?
fibrillation
What causes rapid vision change?
diabetes causes rapid vision change,retina changes are big problem (NPDR)
What causes a rapid pulse?
in heart beat a rapid pulse is caused by intake of coffee,running,alcohol or narcotics. Rapid Heartbeat on Healthgrades.com, including information on symptoms, causes and treatments.
How many beats per minute would result in flutter?
Atrial Flutter is characterized by rapid depolarization of a single atrial focus at a rate of 250-350 BMP
Rapid potassium infusion causes diastolic or systolic cardiac arrest?
Rapid potassium infusion causes diastolic and not systolic cardiac arrest.
What type of countries have rapid population growth?
causes of rapid growth of service industry in the country?
What is an event when one or more presynaptic neurons fire in rapid order it produces a much greater depolarization of the postsynaptic membrane than would result from a single ESPS?
temporal summation
What causes rapid changes in earths surface?
Earthquake.
What growth phase will gram - positive bacteria be most susceptible to penicillin?
Bacteria are most sensitive to antibiotics during the exponential stage (rapid growth).
