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How does copd affect total lung volume, vital capacity, and forced expiratiry volume?

How does copd affect total lung volume, vital capacity, and forced expiratiry volume?
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COPD is is a chronic obstructive pulmonary lung diseases which causes breathing problems and obstructed airflow from the lungs.Lung volume is the amount of air in the lungs during respiratory cycle.In COPD lung volume is increased du e to airway obstruction.Vital capacity is a maximum amount of air a person can expel from lungs after a maximum inhalation.In COPD the airflow to lungs is poor, so vital capacity is decreased.Forced expiratory volume is the air a person can exhale during a forced breath .In COPD forced expiratiry volume values are are lower due to poor air entry.

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