Action Potentials

Front

When a neuron is depolarized, what are the first channels to open? Sodium, Potassium, Calcium, ACTH

Back

Sodium

Front

When a neuron is resting, the inside of the axon has a ____________ charge.

Back

-70 mV

Front

When a neuron is not engaged in an impulse.

Back

Resting potential

Front

Why is -55 mV a significant number?

Back

This is the threshold required to complete an action potential.

Front

At what stage does Potassium end outside the neuron, and Sodium ends inside the neuron? Options: Depolarization, Repolarization, Hyperpolarization, Resting Potential

Back

Repolarization

Front

Why is hyperpolarization important?

Back

It prevents a second, unwanted signal from being sent.

Front

Which ion is pumped into the axon of a neuron to help maintain the resting potential?

Back

potassium

Front

Why is the speed of an impulse increased if a neurone is wrapped in myelin?

Back

the impulse can jump from node to node

Front

After depolarization what happens to restore resting potential? Options: Sodium channels open & sodium ions diffuse out of the neuron., Potassium channels open & potassium ions diffuse into the neuron., Potassium channels open and potassium ions diffuse out of the neuron., Sodium channels open and sodium ions diffuse into the neuron.

Back

Potassium channels open and potassium ions diffuse out of the neuron.

Front

What describes the phase of quick entry of sodium ions into an axon during an action potential?

Back

depolarization