U4L2 - Nerve Impulse Steps

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

• Sodium
• Potassium
• Calcium
• ACTH

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

• positive
• negative

Which ions are involved in the electrical nerve impulse?

• Iodine and Sodium
• Potassium and Sodium
• Iron and Sodium
• Calcium and Iodine

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 is true

Depolarization occurs when

• sodium channels open

• potassium channels open

• sodium channels close

• potassium channels close

Z

• Dendrite
• Axon Terminal
• Neurotransmitters
• Synapse

W

• Axon Terminal Button
• Neurotransmitters
• Dendrite
• Synapse

X

• Axon Terminal Button
• Neurotransmitters
• Dendrite
• Synapse

calcium is responsible for

• signaling the release of the neurotransmitter

• signaling Na to be released into the membrane

• signaling the release of K out of the membrane

• serving as the neurotransmitter

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

• +40mV
• -30mV
• +55mV
• -70mV