When the Diaphragm and External Intercostal Muscles Contract

question 18

Multiple Choice

When the diaphragm and external intercostal muscles contract,

• A) the volume of the thorax increases.
• B) the volume of the thorax decreases.
• C) the volume of the lungs decreases.
• D) the lungs shrink.
• E) expiration occurs.

---

Definitions:

Households

An economic unit of one or more persons living together who make joint decisions on consumption and savings.

Economic Growth

An increase in the production of goods and services in an economy over a period of time, typically measured by the rise in the Gross Domestic Product (GDP).

Production Possibilities Frontier

A graph that illustrates all the highest production options for two or more products, based on a specific set of resources, such as labor and materials.

Trade-Offs

The concept of giving up one thing in return for gaining another, often used in the context of making decisions that involve a compromise.