Even in Healthy Young Subjects, Regional Differences in Pulmonary Ventilation

question 65

Multiple Choice

Even in healthy young subjects, regional differences in pulmonary ventilation and blood flow result in the PaO₂ being lower than the PAO₂. Why is this so?

• A) Most blood flows through the apexes of the lung.
• B) Most blood flows through areas with high.
• C) Most blood flows through the bases of the lung.
• D) Most ventilation goes to the apexes of the lung.

---

Definitions:

Cohorts

A group of individuals having a statistical factor (such as age or class year) in common in a demographic study.

Vietnam War

A prolonged conflict (1955-1975) between Communist forces in North Vietnam and the government of South Vietnam, with significant involvement by the United States.

Social Security

A government program designed to provide financial assistance to the elderly, disabled, and survivors, funded by payroll taxes.

Cohorts

Groups of individuals sharing a common characteristic, typically used in studies to assess how certain variables affect certain populations over time.