Which Is the Incorrect Pairing Between Phase of the Action

question 46

Multiple Choice

Which is the incorrect pairing between phase of the action potential of ventricular muscle fibers and event that occurs within the phase?

• A) Rising phase: opening of voltage-gated Na⁺ channels
• B) Falling phase: closing of K⁺ channels
• C) Plateau phase: prolonged opening of voltage-gated Ca²⁺ channels
• D) Falling phase: closure of Ca²⁺ channels
• E) Rising phase: closure of K⁺ channels

---

Definitions:

Raw Materials

The basic materials and substances that are used in the production of goods, often processed in various ways to create the final product.

Direct Labor Cost

The total expense of employing workers directly involved in manufacturing goods, including wages, benefits, and insurance.

Manufacturing Overhead

All indirect costs associated with manufacturing, including utilities, rent, and salaries for indirect labor.

Direct Labor-hour

A measure of the work done by labor in producing goods, calculated as the total hours of direct labor expended on the production of goods.