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Chapter 39: Q.18 (page 1147)

What does FEV1/FVC measure? What factors may affect FEV1/FVC?

Short Answer

Expert verified
  • The FEV1 measures how much air you can exhale in one second.
  • The FVC measures the total amount of air you can exhale forcefully in one breath.

Step by step solution

01

Step 1. Introduction

  • The FEV1/FVC is a ratio that reflects the amount of air forcefully exhale from lungs. It's measured by spirometry, a test used to evaluate lung function.
  • The FEV1/FVC ratio is often used in diagnosing and monitoring the treatment of lung diseases such as chronic obstructive pulmonary disease (COPD).
02

Step 2. Explanation

  • The FEV1 measures how much air you can exhale in one second.
  • The FVC measures the total amount of air you can exhale forcefully in one breath.

The factors that affect FEV1/FVC are :

  • factors include respiratory muscle strength, body mass index (BMI), coexisting medical conditions, and previous chest injury or operations.

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Most popular questions from this chapter

How does the administration of 100 percent oxygen save a patient from carbon monoxide poisoning? Why wouldn鈥檛 giving carbon dioxide work?

If a patient has increased resistance in his or her lungs, how can this be detected by a doctor? What does this mean?

What is the reason for having residual volume in the lung?

How would paralysis of the diaphragm alter inspiration?

a. It would prevent contraction of the intercostal muscles.

b. It would prevent inhalation because the intrapleural pressure would not change.

c. It would decrease the intrapleural pressure and allow more air to enter the lungs.

d. It would slow expiration because the lung would not relax.

Which of the following statements about the mammalian respiratory system is false?

a. When we breathe in, air travels from the pharynx to the trachea.

b. The bronchioles branch into bronchi.

c. Alveolar ducts connect to alveolar sacs.

d. Gas exchange between the lung and blood takes place in the alveolus
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