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What are index minerals and their importance? Give an example of minerals that would be found in low-grade, intermediate, and high-grade metamorphosed shale.
Alveoli
Small air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place.
Costal Angle
The angle formed by the meeting of the lower borders of the rib cage, usually becoming more acute when the ribs are drawn together during inspiration.
Kyphosis
An excessive outward curvature of the spine, leading to a hunched back appearance.
Barrel Chest
A chest shape characterized by an increased front-to-back diameter and a rounded appearance, often seen in chronic obstructive pulmonary disease (COPD).
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