The Contraction of the Diaphragm and the External Intercostal Muscles

question 87

Essay

The contraction of the diaphragm and the external intercostal muscles begins inspiration.Explain exactly what happens,in terms of volume and pressure changes in the lungs,when these muscles contract.

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Definitions:

Birthrate

The number of live births per 1,000 people in a population over a specified period, often used as an indicator of demographic trends.

U.S. History

The study of the history of the United States of America from its founding to the present day, focusing on major events, figures, and social changes over time.

Demographic Transition Model

The Demographic Transition Model is a theoretical model that describes the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system.

Birthrate

The number of live births per thousand people in a population per year.