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The “Human Respiratory System Model” (Blister Series) by IBEX SCIENCES is a three-dimensional, vacuum-formed plastic relief model engineered as a visual and tactile teaching aid. It is commonly used in biology classes, anatomy labs, and medical training facilities to demonstrate how the human body exchanges oxygen and carbon dioxide. [1, 2]
The lightweight “blister” format features a highly detailed, color-coded raised profile that allows students to track the pathway of air from the upper respiratory tract down into the deep structures of the lungs.
1. The Upper Respiratory Tract
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- Nasal & Oral Cavities: The entry points where inhaled air is filtered, warmed, and humidified.
- Pharynx & Larynx: The throat pathways and the “voice box” containing the vocal cords, illustrating the intersection of the digestive and respiratory paths.
- Epiglottis: The leaf-shaped flap of cartilage that prevents food and liquid from entering the airway during swallowing.
2. The Conducting Airways
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- Trachea (Windpipe): Depicted with its characteristic C-shaped rings of hyaline cartilage that keep the main airway permanently open.
- Bronchial Tree: Shows the bifurcation of the trachea into the left and right primary bronchi, which further branch out inside the lungs into smaller bronchioles. [1]
3. The Lower Respiratory Tract & Organs
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- Lungs (Cross-Sectional Detail): Features a dual-sided design where one side shows the external lobes of the lung, and the opposite side displays a dissected view of the internal vascular and airway networks.
- Alveoli (Magnified Inset): Many models include a microscopic relief inset showing the tiny air sacs (alveoli) wrapped in a network of capillaries, demonstrating where gas exchange takes place. [1]
4. Mechanics of Breathing
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- The Diaphragm: The dome-shaped muscle located at the base of the chest cavity, clearly delineated to explain how its contraction and relaxation drive the inhalation and exhalation processes.
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