Functional Human Respiratory System Model

Functional Human Respiratory System

Mechanoreceptor Simulation: Utilizes a high-elasticity latex diaphragm and reinforced, shatter-resistant PVC thoracic chamber to realistically simulate intrapleural pressure changes during inhalation and exhalation cycles.

Anatomical Integration: Features a specialized Y-shaped bronchial connector coupled with dual high-capacity expansion vessels, precisely replicating the bifurcation of the trachea and subsequent synchronized alveolar inflation patterns.

₹1,265.00

Quick Answer: The functional human respiratory system model is a working model used to demonstrate how breathing happens. When its diaphragm is moved, the lungs inflate or deflate, showing students the link between chest volume, air pressure and the flow of air in and out.

How the Working Model Demonstrates Breathing

Breathing is driven by volume change. When the diaphragm contracts it flattens and moves down, the chest cavity gets larger, the pressure inside the lungs falls below atmospheric pressure and air flows in. When it relaxes, the chest gets smaller and air is pushed out. A functional respiratory system model shows this chain in action: the diaphragm is moved by hand and the lungs, usually represented by balloons or flexible bags, fill and empty through the airway.

The model also carries the anatomy that belongs to the lesson, the trachea dividing into two bronchi that each lead to a lung, so a teacher can move from structure to function without changing models. The idea behind it is Boyle’s law, that the pressure of a fixed amount of gas rises as its volume falls, which links the biology lesson with physics.

Every model simplifies. In the body the ribs also move, lifted by the intercostal muscles, and the lungs do not hang in an air-filled space but cling to the chest wall through the pleural fluid. Discussing what the model leaves out is a good exercise for older students. How the diaphragm is operated on this particular model should be confirmed before ordering.

Applications

Demonstrating inhalation and exhalation in school lessons on the respiratory system
Linking breathing to Boyle’s law in combined biology and physics teaching
Critiquing the model: what it shows well and what real lungs do differently
Science fairs and open days, where visitors can operate the diaphragm themselves

Care & Handling

Operate the diaphragm gently and within its normal travel; overstretching the flexible sheet can tear it.
Check seals and flexible parts before each lesson, because a small air leak stops the lungs inflating.
Store the human respiratory system model away from heat and sunlight, which make rubber parts brittle.

Specifications

Type	Working model of breathing mechanics
Demonstrates	Inhalation and exhalation driven by diaphragm movement
Anatomy shown	Trachea, bronchi and two lungs, as usually modelled
Principle	Volume and pressure change in the chest (Boyle’s law)
Operating mechanism and size	Confirm at enquiry

Why Choose LabEquip

Science teachers usually buy a functional respiratory model because pupils grasp breathing faster by watching the lungs fill than by reading about pressure. LabEquip also offers the simpler human respiratory system jar model and lists this one with its biology lab products. Ask through the contact page how the diaphragm is operated.

Frequently Asked Questions

Why do the lungs inflate when the diaphragm moves down?

Moving the diaphragm down increases the volume of the chest. The air pressure inside the lungs falls below the pressure outside, so air flows in until the two are equal.

What is Boyle’s law and how does it apply to breathing?

Boyle’s law states that, at constant temperature, the pressure of a fixed amount of gas is inversely proportional to its volume. The chest uses this by changing its volume so that air moves in and out.

What are the limitations of a breathing model?

Most models show only the diaphragm, while in the body the ribs and intercostal muscles also move. Real lungs are held against the chest wall by pleural fluid rather than hanging in an air space.

Is exhalation active or passive?

At rest it is mostly passive: the diaphragm relaxes and the elastic lungs recoil. During exercise or forced breathing, abdominal and internal intercostal muscles contract to push air out faster.

Which classes use a functional respiratory model?

It suits middle and secondary school biology and introductory nursing or physiology courses, wherever the mechanism of breathing is taught.

How is it different from a bell-jar breathing model?

A bell-jar model is the simplest version, with balloons inside a jar and a rubber sheet at the base. This listing is described as a functional model of the human respiratory system, which points to a more anatomical design, so confirm its exact form when ordering.

Last Updated: September 2026