Unit 4 Lecture 2 Review- Steps of a nerve impulse

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

• Sodium

• Calcium

• Potassium

• Sodium potassium pump

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

• positive

• negative

When a neuron is at REST,

• the inside of the neuron is negatively charged compared to the outside.

• the inside of the neuron is positively charged compared to the outside.

• there is no charge difference established

• none of these are true

Tags

NGSS.HS-LS1-3

Depolarization occurs when

• sodium channels open

• potassium channels open

• sodium channels close

• potassium channels close

Tags

NGSS.HS-LS1-3

Based on the descriptions in the image, the ion channels that open during an action potential are which kind of channel?

• Ligand-gated

• Mechanically-gated

• Voltage-gated

• Always open

What is structure Z?

• Dendrite

• Axon terminal

• Neurotransmitters

• Synapse

Remember that neurons send signals from one neuron to the next... and so if we know how the action potential travels down a single neuron, and we know what happens when action potentials reach the end of a motor neuron, what do you think structure W might be if instead of stimulating a muscle, the neuron was simply communicating with another neuron?

• axon terminal

• dendrite

• neurotransmitters

• synapse

What is the normal resting potential of a neuron cell membrane?

• +40 mV

• -30 mV

• +55 mV

• -70 mV

Tags

NGSS.HS-LS1-3

In resting potential, neurons have more _________ on the outside of the cell membrane.

• K+

• NaCl

• Na+

• Ca2+

At what stage are both ions present in large concentrations INSIDE the neuron?

• Depolarization

• Repolarization

• Hyperpolarization

• Resting Potential