Action Potentials/ Synaptic Transmission/ Muscle Contraction

The operation of 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 into the cell & potassium ions out of the cell

Tags

NGSS.HS-LS1-3

Name the ion that is pumped into the axon to maintain resting potential. 

• Calcium
• Hydrogen
• Potassium 
• Sodium 

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

Neural transmission across a synaptic cleft is accomplished by: 

• the movement of sodium & potassium from the presynaptic neuron to the postsynaptic neuron.
• impulses traveling as electrical currents across the gap. 
• impulses causing the release  of a neurotransmitter signal and its diffusion across the gap.
• impulses ricocheting back and forth across the gap.

-70 mV is the measure of a

• Threshold Potential
• Action Potential
• Resting Potential
• End Point Potential

A membrane potential becoming less negative is called

• hyperpolarization
• depolarization
• repolarization
• polarization

When a neuron is depolarized, what are the first channels to open?

• Sodium
• Potassium
• Calcium
• ACTH

What number on the graph represents the Hyperpolarization phase?

• 1
• 2
• 3
• 4

Name the ion that is pumped into the axon to maintain resting potential. 

• Calcium
• Hydrogen
• Potassium 
• Sodium