Economic Models Are

question 53

Multiple Choice

Economic models are:

• A) created and used in order to duplicate virtually every aspect of the real world.
• B) useless if they are simple.
• C) made generally of wood, plastic, and/or metal.
• D) built using assumptions.

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Definitions:

Preload

The degree of stretch of cardiac muscle fibers at the end of diastole, affecting the force of contraction.

Cardiac Output

The volume of blood the heart pumps per minute, a critical measure of heart function and body's demand for oxygen.

Sympathetic Nerves

Part of the autonomic nervous system, these nerves prepare the body for stress-related activities, often described as the "fight or flight" response.

Ventricular Contraction

The phase of the heart cycle in which the ventricles contract, pumping blood out of the heart to the body and the lungs.