Action Potential, Synapse, Neurotransmitters VERSION B

What number(s) on the graph represents the Resting Potential?

• 1 and 2

• 3 and 4

• 2 and 3

• 1 and 5

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

• -75 mV

• -55 mV

• 40 mV

• -70 mV

Why is hyperpolarization important?

• It prevents a second, unwanted signal from being sent

• It makes sure the neuron is healthy

• It makes sure the neurons are in the correct space

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

Which of the following restores the resting membrane potential in a neuron?

I. Na+ channels opening

II. K+ channels closing

III. The Na+/K+ ATP pump

• I and II only

• III only

• I and III only

• II and III only

How does the nervous system distinguish between a weak and very strong stimulus?

• A strong stimulus has a higher action potential

• A strong stimulus produces a higher frequency of action potentials

• A strong stimulus has a wider action potential

• A strong stimulus has a steeper action potential

A signal molecule that transmits nerve impulses across synapses

• Neuron

• Action potential

• Nerve

• Neurotransmitter

An electrical impulse within a single neuron is called a

• Action potential

• Membrane potential

• Synapse

• Cell body

What generates a nerve impulse on the post-synaptic membrane?

• Neurotransmitter binding with a receptor site

• Potassium leaking into the post-synaptic membrane

• Calcium binding with receptor sites

• Neurotransmitter being removed from the synapse

The location of neurotransmitters

• Schwann cells

• Dendrites

• Axon terminals

• Cell body or Soma

Depolarization occurs because

• More sodium ions diffuse into the cell than potassium ions diffuse out of the cell

• More potassium ions diffuse out of the cell than sodium ions diffuse into the cell

• More potassium ions diffuse into the cell than sodium ions diffuse out of the cell

• More sodium ions diffuse out of the cell than potassium ions diffuse into the cell