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question 1

Essay

Use the answer code below to answer this section.
$\begin{array}{lr}\text { 1. Two permeability changes that occur at the }\\\text { peak of an action potential }&\text { increased } \mathrm{P}_{\mathrm{Na}+}\_\_\_\\\text { 2. Ion movement responsible for the rising }&\text { decreased } \mathrm{P}_{\mathrm{Na+}} \text { and }\\\text { phase of the action potential }&\text { increased } \mathrm{P}_{\mathrm{K}+}\_\_\_\\\text { 3. Ion movement responsible for the falling }\\\text { phase of the action potential }&\mathrm{Na} \text { influx }\_\_\_\\\text { 4. Permeability change that occurs at threshold }&\mathrm{K}^{+} \text {efflux }\_\_\_\end{array}$

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Definitions:

Cash Dividend

A payment made by a company out of its profits to its shareholders in cash, typically on a regular basis.

Treasury Stock

Shares that were once part of the outstanding shares and have been bought back by the issuing company, reducing the amount of stock on the open market.

Common Stock

Equity shares that represent a form of corporate ownership, entitling the shareholder to a share of the company's success through dividends and or capital appreciation.

Stock Split

A corporate action that increases the number of shares in a company, reducing the price per share without changing the market capitalization.