Biomaterial Database

Static mechanical properties of bronchi in normal excised human lungs. 1978

U B Prakash, and R E Hyatt

Bronchographic studies were performed on 22 normal human lungs at transpulmonary pressures between 20 and 0 cmH2O. Pressure-diameter behavior of 322 bronchi was evaluated. In younger (less than 40 yr) subjects, the airways of males showed greater recoil than those of females. No difference between sexes was seen in older (greater than 40 yr) subjects. Bronchi less than 2.1 mm diam had a significant decrease in recoil with increasing age in males but not in females. Small bronchi had greater recoil than large bronchi in both sexes in the younger group but not in the older group. The younger group had evidence of anisotropic behavior of the bronchi not seen in the older group. The percentage decrease in lung volume for a given decrease in transpulmonary pressure was less in the older than in the younger subjects in both sexes. Measurements of the cube root of lung volume, bronchial length, and the position of markers attached to the pleura indicated that the lungs deflated in an overall, isotropic manner down to a pressure of 3 cmH2O.

UI	MeSH Term	Description	Entries
D008168	Lung	Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.	Lungs
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D009130	Muscle, Smooth	Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)	Muscle, Involuntary,Smooth Muscle,Involuntary Muscle,Involuntary Muscles,Muscles, Involuntary,Muscles, Smooth,Smooth Muscles
D010991	Plethysmography	Recording of change in the size of a part as modified by the circulation in it.	Plethysmographies
D001980	Bronchi	The larger air passages of the lungs arising from the terminal bifurcation of the TRACHEA. They include the largest two primary bronchi which branch out into secondary bronchi, and tertiary bronchi which extend into BRONCHIOLES and PULMONARY ALVEOLI.	Primary Bronchi,Primary Bronchus,Secondary Bronchi,Secondary Bronchus,Tertiary Bronchi,Tertiary Bronchus,Bronchi, Primary,Bronchi, Secondary,Bronchi, Tertiary,Bronchus,Bronchus, Primary,Bronchus, Secondary,Bronchus, Tertiary
D002675	Child, Preschool	A child between the ages of 2 and 5.	Children, Preschool,Preschool Child,Preschool Children
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293	Adolescent	A person 13 to 18 years of age.	Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths