Nervous Impulse

The neuron has a single long-part called the ___.

• Dendrites

• Nerve fibers

• Axon

• Nerve Endings

What number(s) on the graph represents the resting potential?

• 1 and 2

• 1 and 5

• 2 and 3

• 3 and 4

When a neuron is depolarised, what are the first channels to open?

• Sodium

• Potassium

• Calcium

• ACTH

When a neuron is not engaged in an impulse, it is said to have a...

• Resting potential

• Action potential

• Neural potential

• Synaptic potential

When a neuron is resting, the inside of the axon has a potential difference of...

• -55 mV

• -70 mV

• 40 mV

• -75 mV

What number on the graph represents the depolarization phase?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS3-5

What number on the graph represents the hyperpolarisation phase?

• 1

• 2

• 3

• 4

The sodium-potassium pump....

• Sends (Na⁺) into the cell

• Sends (K⁺) into the cell

• Exchanges (K⁺) & (Na⁺) during depolarisation

• Exchanges (K⁺) & (Na⁺) to correct hyperpolarisation

Tags

NGSS.HS-LS1-3

Why is hyperpolarisation important?

• It makes sure the neuron is healthy

• It prevents a second, unwanted signal from being sent

• It makes sure the neurons are in the correct space

• It makes sure the charge is back at -70 mV

During an action potential, the potential difference across the membrane is...

• -70 mV

• +40 mV

• +50 mV

• -40 mV