Understanding Action Potentials

What is the resting potential of a neuron measured at?

• Positive 40 millivolts

• Negative 70 millivolts

• Zero millivolts

• Positive 70 millivolts

During an action potential, which ions enter the axon?

• Potassium ions

• Calcium ions

• Sodium ions

• Chloride ions

What happens during the refractory period of a neuron?

• The neuron cannot generate another action potential

• The neuron releases neurotransmitters

• The neuron becomes hyperpolarized

• The neuron can fire multiple action potentials

What does the all-or-none principle state about neuron firing?

• Neurons fire with varying degrees of strength

• Neurons fire to the same degree each time

• Neurons fire only when stimulated by light

• Neurons can fire without reaching a threshold

How do stronger responses occur according to the all-or-none principle?

• By increasing the resting potential

• By more neurons firing simultaneously

• By decreasing the refractory period

• By individual neurons firing more strongly