Action Potential

What are cell membranes made of? Select all that apply.

• Carbohydrates

• Proteins

• Phospholipids

• Nucleic Acids

What are sodium (Na⁺) voltage-gated ion channels made of?

• Carbohydrates

• Proteins

• Phospholipids

• Nucleic Acids

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-6

What is meant by the term "potential"?

• A negative charge inside the neuron

• A difference in charge between the inside and outside of a membrane

• A positive charge outside the neuron

• A hope for better days

What is the resting membrane potential?

• -70 mV

• -55 mV

• -50 mV

• +30 mV

Tags

NGSS.HS-LS1-3

What must happen within a neuron for it to reach its threshold in order to carry out an action potential?

• Potassium ions must diffuse outside of the cell causing the inside to become increasingly more positive.

• Sodium ions must diffuse outside of the cell causing the inside to become increasingly more negative.

• Potassium channels open to allow ions to move outside of the cell in order to make the cell increasingly more negative.

• Sodium ions enter the cell via open channels in order to make the inside of the cell increasingly less negative.

What is the threshold to initiate an action potential (nerve impulse)?

• -70 mV

• -55 mV

• -50 mV

• +30 mV

What causes sodium (Na⁺) voltage-gated ion channels to open?

• A membrane potential of -70 mV

• A membrane potential of -55 mV

• A membrane potential of 0 mV

• A membrane potential of +30 mV

What is the function of Na⁺ voltage-gated ion channels in neurons?

• Allows sodium ions to exit or enter cell in response to a specific potential (voltage)

• Open in response to mechanical change which allows sodium ions to enter the cell

• Open in response to a specific potential (voltage), which allows sodium ions to enter the cell

• Allows ions to enter the cell

Tags

NGSS.HS-PS2-5

What is the function of the action potential in neurons?

• To send an electrical signal (impulse) through a neuron

• To maintain resting membrane potential

• To change a neuron's potential

• To receive input from receptors

What two actions are caused by a membrane potential of +30 mV?

• A stimulus

• Sodium (Na⁺) voltage-gated ion channels close

• Potassium (K⁺) voltage-gated ion channels close

• Potassium (K⁺) voltage-gated ion channels open