Ib Biology Neurons and Synapses

The nerve impulse is an electrical current that travels along dendrites or axons.

• True 
• False

When a cell is at rest, the inside is more _____ and the outside is more ______. 

• negative; positive
• positive; negative 

The operation of the sodium-potassium "pump" moves:

• sodium & potassium ions into the cell

• sodium & potassium ions out of the cell

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

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

Tags

NGSS.HS-LS1-3

After depolarization what happens to restore resting potential?

• Sodium channels open & sodium ions diffuse out of the neuron.

• Potassium channels open and potassium ions diffuse into the neuron.

• Potassium channels open and potassium ions diffuse out of the neuron.

• Sodium channels open and sodium ions diffuse into the neuron.

What describes the phase of quick entry of sodium ions into an axon during an action potential? 

• passive transport
• depolarization
• ion transport
• repolarization 

What generates a nerve impulse on the post-synaptic membrane? 

• Calcium binding with a receptor site
• Potassium leaking into the post-synaptic membrane 
• Neurotransmitter binding with receptor sites
• Neurotransmitter being removed from the synapse

For a neuron with a resting membrane potential at -70mv, an increase in the movement of sodium ions into the neuron's cytoplasm would result in:

• the depolarization of the neuron.
• the repolarization of the neuron 
• the replacement of potassium ions with sodium ions.
• the replacement of potassium ions with calcium ions.

Label the Neuron-What does the letter "A" represent?

• Axon
• Dendrite
• Axon Terminal
• Cell Body

Label the Neuron-What does the letter "D" represent?

• Dendrite
• Axon
• Myelin Sheath
• Node of Ranvier

What is the insulating membrane that surrounds parts of the axon that helps the impulses travel faster called?

• Axon
• Dendrites
• Node of Ranvier
• Myelin Sheath