Ions Can Move Across the Plasma Membrane in Which of the Following

question 22

Multiple Choice

Ions can move across the plasma membrane in which of the following ways?

• A) through voltage-gated channels as in the action potential
• B) through passive or leak channels
• C) by ATP-dependent ion pumps like the sodium-potassium exchange pump
• D) through chemically-gated channels as in neuromuscular transmission
• E) all of the above

---

Definitions:

Credit Sales

Transactions where goods are sold and payment is deferred, typically allowing the customer to pay at a later date without interest.

Allowance for Doubtful Accounts

A contra-asset account that reduces the total receivables on the balance sheet to reflect the amount expected to be uncollectible.

Adjusting Entry

An adjustment recorded in the bookkeeping records at the end of an accounting period to allocate income and expenditure to the period in which they actually occurred.

Bad Debt Expense

The estimated amount of credit sales that are not expected to be collected, recognized as an expense in the income statement.