Nerve Impulse

Front

What ions are primarily involved in the generation of an electrical nerve impulse?

Back

Potassium and Sodium are the primary ions involved in generating an electrical nerve impulse.

Front

What is the function of the Myelin Sheath in nerve cells?

Back

The Myelin Sheath is an insulating membrane that surrounds parts of the axon, helping to protect and propagate the action potential.

Front

What is the term for the process of returning to the resting phase of a neuron?

Back

Repolarization is the process of returning to the resting phase of a neuron.

Front

What does the Resting Potential of a neuron refer to?

Back

Resting Potential refers to the state of a neuron when it is not actively sending a signal, typically around -70mV.

Front

Which channels open first when a neuron is depolarized?

Back

Sodium channels are the first to open when a neuron is depolarized.

Front

What is depolarization in the context of nerve impulses?

Back

Depolarization is the process by which the membrane potential becomes less negative (more positive) due to the influx of sodium ions.

Front

What role do Potassium ions play during the action potential?

Back

Potassium ions help to repolarize the neuron by moving out of the cell after depolarization.

Front

What is the Node of Ranvier and its significance?

Back

The Node of Ranvier is a gap in the myelin sheath that facilitates rapid conduction of nerve impulses through saltatory conduction.

Front

Define action potential in the context of nerve impulses.

Back

Action potential is a rapid rise and fall in voltage across a cellular membrane, allowing for the transmission of signals along neurons.

Front

What is the all-or-nothing principle in nerve impulses?

Back

The all-or-nothing principle states that once a threshold is reached, a neuron will fire an action potential fully or not at all.