Carefully Define the Following Terms, and Explain Their Importance in Economics

question 84

Essay

Carefully define the following terms, and explain their importance in economics.
a.opportunity cost
b.abstraction
c.theory
d.model
e.marginal analysis

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Definitions:

Atria Contract

refers to the phase in the cardiac cycle when the atria (upper chambers of the heart) contract to push blood into the ventricles.

Plateau Phase

Prolongation of the depolarization phase of a cardiac muscle cell membrane; results in a prolonged refractory period.

Cardiac Muscle Cell

Cardiac muscle cell, also known as a cardiomyocyte, is a specialized type of muscle cell found in the heart that contracts to pump blood throughout the body.

Action Potential

The process by which nerve cells generate an electrical signal after being stimulated, involving a dramatic change in charge across the cell membrane.