Nerve Impulses/Action Potential

What is the insulating membrane that surrounds parts of the axon that helps to protect & propagate action potential?

• Axon
• Dendrites
• Node of Ranvier
• Myelin Sheath

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

part of a neuron that receives information from other neurons

• axon
• dendrites
• myelin sheath
• synapse

a signal molecule that transmits nerve impulses across synapses

• neuron
• neurotransmitter
• nerve
• action potential

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

Depolarization occurs when

• sodium channels open

• potassium channels open

• sodium channels close

• potassium channels close

Z

• Dendrite
• Axon Terminal
• Neurotransmitters
• Synapse

when does the stimuli cause an action potential?

• when it reaches threshold

• just below the threshold

• just above threshold