Synapses and Action Potentials

A nerve impulse is also called:

• Action potential

• Stimulus

• Receptor

• Threshold

A message that we can feel is called:

• Action potential

• Stimulus

• Receptor

• Threshold

The thing that feels the stimulus (message) is called

• Action potential

• Stimulus

• Receptor

• Threshold

The minimum (smallest) change needed for the active potential is called

• Action potential

• Stimulus

• Receptor

• Threshold

When the neuron is resting which ions are moving by active transport?

• Sodium (Na+)

• Potassium (K+)

• Calcium

When the neuron reaches the threshold, which ion moves into the cell?

• Sodium (Na+)

• Potassium (K+)

• Calcium

When all of the sodium has diffused into the cell, which ion moves out of the cell?

• Sodium (Na+)

• Potassium (K+)

• Calcium

Which channel opens first in the action potential?

• Sodium (Na+)

• Potassium (K+)

Which channel opens second in the action potential?

• Sodium (Na+)

• Potassium (K+)

Movement of molecules from high to low concentration is called:

• Diffusion

• Active transport