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The Respiratory System

The Respiratory System

The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.

Respiratory Volumes and Capacities I

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...

Anatomy of Respiratory System I: Upper Respiratory Tract

Anatomy of Respiratory System I: Upper Respiratory Tract

The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
Nose and nasal cavity
The nose and nasal cavity represent the main external openings of the respiratory tract.

Anatomy of Respiratory System II: Lower Respiratory Tract

Anatomy of Respiratory System II: Lower Respiratory Tract

The lower respiratory tract is anatomically composed of several vital structures, including the larynx, trachea, bronchial tree, alveoli, lungs, and pleurae. Each component has a specific function, and all are intricately connected to ensure efficient respiration.
The Larynx
It is located between the pharynx and the trachea, acts as a passageway for air, and hosts several critical structures, such as the epiglottis, vocal cords, and glottis. The epiglottis acts as a gateway, guiding food to the...

Respiratory Volumes

Respiratory Volumes

Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...

Mechanism of Breathing III: The Accessory Muscles

Mechanism of Breathing III: The Accessory Muscles

The Role of Accessory Muscles in the Respiratory System
The respiratory system is a complex network that relies on primary respiratory muscles like the diaphragm, but also involves accessory muscles to enhance lung expansion and airflow during both inhalation and exhalation.
Enhancing Inhalation with Accessory Muscles:
Accessory muscles such as the sternocleidomastoid, scalene, intercostal, and abdominal muscles are crucial when additional respiratory effort is required, such as during deep...

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Related Experiment Video

Updated: Jun 25, 2026

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Published on: May 15, 2013

Human respiratory mechanics demonstration model.

Janelle Anderson¹, Chris Goplen, Lynn Murray

¹Department of Biomedical Engineering, University of Wisconsin, 1300 University Ave., Madison, WI 53706, USA.

Advances in Physiology Education

|March 6, 2009

Summary

This study introduces an innovative respiratory mechanics model for educators and students. The device accurately demonstrates breathing-related pressure changes, enhancing understanding of complex physiological concepts.

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Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Published on: April 19, 2024

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Last Updated: Jun 25, 2026

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Published on: May 15, 2013

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Published on: April 19, 2024

Area of Science:

Physiology
Medical Education

Background:

Respiratory mechanics is a challenging subject for students and instructors.
Current models lack the ability to demonstrate rib cage movement's effect on pressures.

Purpose of the Study:

To develop a versatile respiratory mechanics model for classroom use.
To enhance the understanding of respiratory physiology through real-time demonstrations.

Main Methods:

A novel respiratory mechanics model was created with digital displays and computer integration.
The model simulates diaphragm and rib cage movement to illustrate pressure changes.
Device and classroom testing were conducted to validate its effectiveness.

Main Results:

The model accurately demonstrated pressure changes proportional to physiological values.
Classroom testing with 427 students showed a statistically significant improvement in understanding (P < 0.05).

Conclusions:

The developed respiratory mechanics model is an effective instructional tool.
The study provides instructions for replicating the model, promoting wider adoption.