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A person with asthma may have a healthy VC, but a reduced FEV1. Explain how this can be.

A person with asthma may have a healthy VC, but a reduced FEV1. Explain how this can be.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Text:** "A person with asthma may have a healthy VC, but a reduced FEV₁. Explain how this can be." **Explanation for Educational Website:** In this context, "VC" stands for Vital Capacity and "FEV₁" stands for Forced Expiratory Volume in one second. - **Vital Capacity (VC)** is the maximum amount of air a person can exhale after a maximal inhalation. A healthy VC indicates that the total lung capacity is normal. - **Forced Expiratory Volume in one second (FEV₁)** measures how much air a person can forcefully exhale in the first second of a breath. In asthma, airway obstruction can make it difficult to exhale air quickly, which can result in a reduced FEV₁ despite having a full lung capacity and normal VC. Airways become narrower due to inflammation and mucus, hindering airflow particularly during exhalation. This is why a person with asthma might display a normal VC but a lower FEV₁.
Transcribed Image Text:**Text:** "A person with asthma may have a healthy VC, but a reduced FEV₁. Explain how this can be." **Explanation for Educational Website:** In this context, "VC" stands for Vital Capacity and "FEV₁" stands for Forced Expiratory Volume in one second. - **Vital Capacity (VC)** is the maximum amount of air a person can exhale after a maximal inhalation. A healthy VC indicates that the total lung capacity is normal. - **Forced Expiratory Volume in one second (FEV₁)** measures how much air a person can forcefully exhale in the first second of a breath. In asthma, airway obstruction can make it difficult to exhale air quickly, which can result in a reduced FEV₁ despite having a full lung capacity and normal VC. Airways become narrower due to inflammation and mucus, hindering airflow particularly during exhalation. This is why a person with asthma might display a normal VC but a lower FEV₁.
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