Lesson Recap ~ Nervous Tissue ~ Slides 19-30

What is the resting membrane potential (RMP) of a neuron?

• -70 mV

• 0 mV

• +30 mV

• -55 mV

Which ions are primarily involved in the action potential?

• Sodium and potassium

• Calcium and magnesium

• Hydrogen and chloride

• Carbon and nitrogen

At what voltage do voltage-gated Na+ channels open during an action potential?

• -70 mV

• 0 mV

• +30 mV

• -55 mV

During depolarization, which ion moves into the neuron?

• Calcium

• Potassium

• Sodium

• Magnesium

What happens when the action potential reaches +30 mV?

• Na+ channels open

• K+ channels open

• Ca+ channels open

• All channels close

At what voltage do K+ channels begin to close?

• -55 mV

• -70 mV

• -90 mV

• 0 mV

What role does ATPase play in action potentials?

• Generates action potential

• Opens Na+ channels

• Restores resting potential

• Depolarizes the cell

Which cells can generate an action potential?

• Only neurons

• Muscle cells

• Epithelial cells

• All cells

What is the threshold potential for generating an action potential?

• -55 mV

• -90 mV

• +30 mV

• -70 mV

Depolarization occurs when the inside of a neuron becomes more…

• Positive

• Negative

• Neutral

• Stable