Nervous System, Part 2 Edpuzzle:

What is the threshold voltge?

-55mv

What is the name of the "Buzz", the signal that a neuron transmits?

Action Potential

What allows ions to diffuse down their electrochemical gradient across the membrane?

Gated Ion Channels

At resting potential the inside of the cell membrane is negatively charged. Why?

More positives outside (Na+) than inside (K+); and more negatives inside (proteins)

Which type of neuron conducts impulses faster?

Myelinated Neurons

How is repolarization acheived?

Potassium ions flow out.

What prevents signals from traveling in both directions down the axon at once?

Refractory Period

In what way would neuron signals change from telling a muscle to pick up a piece of paper to telling a muscle to pick up a bowling ball?

Signals would be sent with higher frequency.

What if threshold is reached?

Sodium channels open, sodium floods in, and the membrane potential reverses to a strong positive voltage.

If the stimulus does NOT cause the membrane potential to reach threshold, what happens?

The cell returns to resting potential.

To start an action potential moving down the axon, what must happen?

Trigger a big enough change in the membrane potential of the neuron body (depolarization) triggering channels to open

The electric potential across a cell membrane is measured in ______.

millivolts