Subject(s)

Altitude , Pulmonary Artery/anatomy & histology , Pulmonary Artery/analysis , Pulmonary Artery/physiology , Aging , Aorta, Thoracic/analysis , Aorta, Thoracic/anatomy & histology , Collagen/analysis , Elastic Tissue/analysis , Elasticity , Elastin/analysis , Humans , In Vitro Techniques , Indians, South American , Peru