Neurophysiology Review

What is the role of the sodium-potassium pump in neuron function?

• It decreases the membrane potential

• It makes the neuron membrane impermeable to ions

• It balances the concentration of sodium and potassium inside and outside the neuron

• It uses ATP to transport sodium and potassium ions across the neuron membrane

Tags

NGSS.HS-LS1-3

At which point on the diagram does depolarization of the axon occur? 

• A
• B
• C
• D

What is the normal resting potential of a neuron cell membrane?

• +40mV
• -30mV
• +55mV
• -70mV

When a neuron is in it's resting state, the inside of the axon has a relatively ____________ charge compared with outside

• positive

• negative

A membrane potential becoming less negative is called

• hyperpolarization
• depolarization
• repolarization
• polarization

In resting potential, neurons have more _________ on the outside of the cell membrane.

• K+
• NaCl
• Na+
• Cl-

Tags

NGSS.HS-LS1-3

Which ion is found in a higher concentration inside a neuron than outside?

• Sodium

• Potassium

• Chloride

What biomolecule forms the ion channels and pumps in the cell membrane?

• carbohydrates

• proteins

• hydrophilic heads

• lipids

True or False: potassium and sodium can enter and leave the cell freely

• True

• False

Tags

NGSS.HS-LS1-3

The sodium-potassium "pump" moves:

• sodium & potassium ions into the cell

• sodium & potassium ions out of the cell

• sodium ions into the cell & potassium ions out of the cell

• sodium ions out of the cell & potassium ions into the cell

Tags

NGSS.HS-LS1-3