Action Potentials and Neuron Function

Action Potentials and Neuron Function

Assessment

Interactive Video

Biology, Science

9th - 12th Grade

Medium

Created by

Sophia Harris

Used 3+ times

FREE Resource

The video explains nerve impulses as electrical signals in neurons, focusing on the movement of ions across cell membranes. It covers resting potential, depolarization, repolarization, and the refractory period, highlighting the role of sodium and potassium ions. Action potentials are described as wave-like patterns, with the importance of reaching threshold potential for neuron firing. The video concludes with hyperpolarization and the energy demands of maintaining resting potential.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a nerve impulse primarily composed of?

Movement of proteins

Movement of charged particles

Flow of water

Flow of electrons

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge inside a neuron at rest?

Positive 70 millivolts

Negative 70 millivolts

Positive 55 millivolts

Negative 55 millivolts

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What triggers the opening of the voltage-gated sodium channels?

Resting potential

Depolarization

Hyperpolarization

Repolarization

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the cell's internal charge during depolarization?

It becomes more negative

It becomes more positive

It remains the same

It fluctuates randomly

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of the sodium-potassium pump during the refractory period?

To restore resting potential

To trigger another action potential

To repolarize the cell

To depolarize the cell

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many sodium ions are moved out of the cell by the sodium-potassium pump?

Two

Five

Four

Three

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In which direction do action potentials move?

They do not move

From dendrites to axon terminals

In both directions

From axon terminals to dendrites

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