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Related Concept Videos

Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

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In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
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Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

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Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...
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Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics01:23

Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics

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Respiratory symptoms, such as congestion and cough, commonly accompany respiratory tract conditions. Various medications, such as antitussives, expectorants, and mucolytics, play crucial roles in providing relief.
Antitussives include codeine, dextromethorphan (Robitussin), and benzonatate (Tessalon). Codeine and dextromethorphan exert their effects centrally by suppressing the cough reflex center in the medulla.  Benzonatate operates peripherally within the respiratory tract by...
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Gross Anatomy of the Lungs01:17

Gross Anatomy of the Lungs

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The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...
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Pulmonary Function Tests01:25

Pulmonary Function Tests

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Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
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Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

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Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs...
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Related Experiment Video

Updated: Jun 15, 2025

Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs
05:40

Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs

Published on: December 22, 2023

279

[Lung function during normal pregnancy].

L Plantier1

  • 1Service de pneumologie et explorations respiratoires, CHRU de Tours, Tours, France; CEPR/Inserm UMR1100, Université de Tours, Tours, France.

Revue Des Maladies Respiratoires
|August 24, 2024
PubMed
Summary
This summary is machine-generated.

During pregnancy, static lung volumes decrease by 20% of residual functional capacity, leading to chronic alveolar hyperventilation. However, standard spirometry measures like vital capacity remain largely unchanged.

Keywords:
Control of ventilationContrôle de la ventilationHyperventilationSpirometrySpirométrie

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Left Lung Orthotopic Transplantation in a Juvenile Porcine Model for ESLP
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Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
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Area of Science:

  • Pulmonology and Obstetrics
  • Physiological Adaptations in Pregnancy

Context:

  • Pregnancy induces significant hormonal, anatomical, and physiological alterations across all bodily systems.
  • Understanding respiratory system adaptations is crucial for managing maternal and fetal health.

Purpose:

  • To review recent data on lung function changes during healthy pregnancy.
  • To synthesize current knowledge on respiratory physiology during gestation.

Summary:

  • Pregnancy reduces static lung volumes by up to 20% of residual functional capacity.
  • Chronic alveolar hyperventilation occurs during pregnancy.
  • Key spirometry variables (vital capacity, FEV1, PEF) and airway resistance show no significant changes.

Impact:

  • Provides a clear overview of respiratory system modifications during pregnancy.
  • Highlights which lung function parameters are affected and which remain stable.
  • Informs clinical practice and future research on respiratory health in pregnant individuals.