Nervous System

Which ions are involved in an action potential?

• Na; Cl
• Na; K
• K; Cl
• Na; Ca

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

• +40mV
• -30mV
• +55mV
• -70mV

Which is the correct order of events in depolarisation then repolarisation? 

• Sodium channels close, potassium channels open
• Sodium channels open, potassium channels open, 
• Sodium channels open, potassium channels close
• Potassium channels open, sodium channels open

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

• A
• B
• C
• D

The sodium potassium pump restores the resting potential. By which process does this work? 

• Osmosis
• Diffusion
• Facilitated diffusion
• Active transport

What is the insulating membrane that surrounds parts of the axon that helps to protect & propagate action potential?

• Axon
• Dendrites
• Node of Ranvier
• Myelin Sheath

When a neuron is not engaged in an impulse.

• Resting potential
• Action potential
• Neural potential
• Synaptic potential

When a neuron is resting, the inside of the axon has a ____________ charge.

• positive
• negative

A membrane potential becoming less negative is called

• hyperpolarization
• depolarization
• repolarization
• polarization

Tags

NGSS.HS-PS2-5

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

• K+
• NaCl
• Na+
• Cl-