Nervous System Signal Impulses

What is the function of the corpus callosum?

• To regulate sodium and potassium levels

• To connect the two hemispheres of the brain

• To produce neurotransmitters

• To transmit action potentials

Which hemisphere of the brain is typically responsible for speech?

• Right hemisphere

• Both hemispheres

• Left hemisphere

• None of the above

What happens when the corpus callosum is severed?

• The brain loses its ability to send action potentials

• The brain experiences seizures

• The two hemispheres of the brain cannot communicate

• The brain becomes more efficient

What is the purpose of the synapse?

• To transmit electrical messages

• To produce neurotransmitters

• To regulate sodium and potassium levels

• To connect neurons together

What are neurotransmitters?

• Proteins that open sodium and potassium channels

• Ions that regulate the voltage of a neuron

• Cells that wrap around the axon

• Chemicals that transmit messages across synapses

What is the main function of the sodium-potassium pump?

• To transmit action potentials

• To establish the resting voltage of a neuron

• To open sodium and potassium channels

• To regulate the flow of calcium ions

What is the purpose of the myelin sheath?

• To insulate and speed up the transmission of action potentials

• To connect neurons together

• To produce neurotransmitters

• To regulate sodium and potassium levels

What is the role of calcium ions in a synapse?

• To regulate the flow of action potentials

• To open sodium and potassium channels

• To establish the resting voltage of a neuron

• To trigger the release of neurotransmitters

What is the voltage of a typical neuron at rest?

• -70 millivolts

• -55 millivolts

• 0 millivolts

• +70 millivolts

What happens when an action potential reaches the end of a neuron?

• Calcium ions influx and neurotransmitters are released

• Sodium and potassium channels open

• The neuron becomes depolarized

• The resting voltage is reestablished