fill in the data chart below for the refractory period.
stage | resting potential | depolarization | repolarization | refractory period
| charge inside the cell (+ or -) | charge outside the cell (+ or -) | where are there more na+ ions? | where are there more k+ ions? | is there a net concentration gradient? | is there a net electrochemical gradient? | which channels/pumps are moving ions? | which ions are moving? which way are they moving? |

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# Brief Explanations:
This table details key properties of neuronal membrane potential stages, based on ion distribution, gradients, and channel/pump activity:
1. **Resting Potential**: Neurons are at a stable negative charge; Na⁺ is concentrated outside, K⁺ inside, creating chemical gradients. Na⁺/K⁺ pumps maintain this state.
2. **Depolarization**: The membrane becomes less negative as Na⁺ rushes in via open Na⁺ channels; K⁺ channels remain closed initially.
3. **Repolarization**: The membrane returns to a negative charge as K⁺ exits via open K⁺ channels; Na⁺ channels close.
4. **Refractory Period**: A temporary state where the neuron cannot fire a new action potential, with K⁺ still leaving (early phase) and Na⁺ channels resetting (late phase).

# Answer:
| Stage                  | Charge inside the cell (+ or -) | Charge outside the cell (+ or -) | Where are there more Na+ ions? | Where are there more K+ ions? | Is there a Net concentration gradient? | Is there a K+ concentration gradient? | Which channels/pumps are moving ions? | Which ions are moving? Which way are they moving? |
|------------------------|---------------------------------|----------------------------------|--------------------------------|--------------------------------|----------------------------------------|----------------------------------------|----------------------------------------|---------------------------------------------------|
| Resting Potential      | -                               | +                                | Outside the cell               | Inside the cell                | Yes (Na⁺ out, K⁺ in)                   | Yes (K⁺ inside > outside)              | Na⁺/K⁺ Pump                            | Na⁺ out of cell; K⁺ into cell                     |
| Depolarization         | Becoming more +                 | Becoming more -                  | Outside the cell               | Inside the cell                | Yes (Na⁺ out > in)                     | Yes (K⁺ inside > outside)              | Voltage-gated Na⁺ Channels             | Na⁺ into the cell                                  |
| Repolarization         | Becoming more -                 | Becoming more +                  | Inside the cell (temporarily)  | Outside the cell (temporarily) | Yes (K⁺ inside > outside)              | Yes (K⁺ inside > outside)              | Voltage-gated K⁺ Channels              | K⁺ out of the cell                                  |
| Refractory Period      | - (hyperpolarized early)        | +                                | Outside the cell (resets)      | Inside the cell (resets)       | Yes (K⁺ out > in early; Na⁺ resets)    | Yes (K⁺ outside > inside early)        | Voltage-gated K⁺ Channels, Na⁺/K⁺ Pump | Early: K⁺ out of cell; Late: Na⁺ out, K⁺ in (resets resting state) |

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Answer:

Stage	Charge inside the cell (+ or -)	Charge outside the cell (+ or -)	Where are there more Na+ ions?	Where are there more K+ ions?	Is there a Net concentration gradient?	Is there a K+ concentration gradient?	Which channels/pumps are moving ions?	Which ions are moving? Which way are they moving?
Depolarization	Becoming more +	Becoming more -	Outside the cell	Inside the cell	Yes (Na⁺ out > in)	Yes (K⁺ inside > outside)	Voltage-gated Na⁺ Channels	Na⁺ into the cell
Repolarization	Becoming more -	Becoming more +	Inside the cell (temporarily)	Outside the cell (temporarily)	Yes (K⁺ inside > outside)	Yes (K⁺ inside > outside)	Voltage-gated K⁺ Channels	K⁺ out of the cell
Refractory Period	- (hyperpolarized early)	+	Outside the cell (resets)	Inside the cell (resets)	Yes (K⁺ out > in early; Na⁺ resets)	Yes (K⁺ outside > inside early)	Voltage-gated K⁺ Channels, Na⁺/K⁺ Pump	Early: K⁺ out of cell; Late: Na⁺ out, K⁺ in (resets resting state)