This medical illustration is a pathophysiology diagram depicting the human respiratory system and the deposition patterns of particulate matter (PM) based on size. The diagram utilizes a human silhouette to map the upper and lower respiratory tracts. Labeled anatomical regions include the nasal passages, pharynx, trachea, primary bronchi, bronchi branches, bronchioli, and alveoli. Each region is annotated with a specific PM size range (presumably in micrometers) that typically deposits there. The data shows a progressive decrease in particle size relative to the depth of penetration: the upper tract (nasal passages) captures larger particles (11–7 µm), the conductive airways (trachea and bronchi) capture mid-sized particles (4.7–1.1 µm), and the deepest acinar regions (bronchioli and alveoli) receive the smallest, ultrafine particles (1.1–0.43 µm). This visual serves as an educational tool for environmental health and pulmonology, illustrating how different particle diameters interact with respiratory anatomy to impact lung health.

This educational anatomical illustration combines a sagittal section of the upper respiratory tract with a coronal view of the lower respiratory system, created as a student project. The superior portion depicts the nasal cavity, oral cavity, pharynx, and larynx in cross-section. Below, the trachea descends and bifurcates into the primary bronchi. The lungs are shown with asymmetrical detailing: the right lung is rendered in a solid pink/red hue indicating tissue parenchyma, while the left lung features a detailed schematic of the bronchial tree and alveolar branching patterns. The central anatomical figure is set within a light-colored torso silhouette. Surrounding the anatomical drawing are symbolic elements including bats and several human faces in states of rest or mask-wearing, set against a blue, wavy background. This visual serves as a medical student's creative synthesis of respiratory anatomy and pathology, likely contextualizing the COVID-19 pandemic and zoonotic disease transmission. The medical focus is on the structural continuity between the upper and lower respiratory tracts.

This medical illustration presents a sagittal anatomical diagram of the human head and neck, coupled with a histological inset of the nasal mucosa. The main diagram depicts the upper respiratory tract including the nasal cavity, hard and soft palate, tongue, pharynx, larynx, and trachea, alongside the brain and cervical spine. An arrow points from the nasal conchae to a detailed histological cross-section of the respiratory epithelium. This inset illustrates a pseudostratified ciliated columnar epithelium, highlighting its cellular composition: basal cells positioned along the basement membrane; secretory goblet cells; and ciliated cells featuring hair-like cilia at the apical surface. A superficial layer of mucus is shown above the cilia, representing the mucociliary clearance mechanism. This educational visual is designed to demonstrate the relationship between gross anatomy and microscopic tissue structure in the context of respiratory physiology and physical defense barriers against pathogens.

This medical infographic displays data on respiratory tract infections (RTIs) in patients with spondyloarthritis (SpA). Panel A utilizes an anatomical diagram of the human respiratory system to map the frequency of specific infections. Upper respiratory tract infections (URTIs) shown include rhinitis (87.3%), laryngitis/pharyngitis (36.1%), sinusitis (34.9%), tonsillitis (12.8%), and otitis media (9.9%). Lower respiratory tract infections (LRTIs) include bronchitis (29.7%), pneumonia (3.3%), and pleuritis (1.6%). Panel B provides a bar chart comparing RTI frequencies between axial spondyloarthritis (axSpA) and psoriatic arthritis (PsA) cohorts, showing no significant differences. Panel C illustrates the distribution of antibiotic courses prescribed, categorized by patient subgroup. Panel D presents a sex-disaggregated analysis, revealing that female patients (black bars) report significantly higher rates of laryngitis/pharyngitis, sinusitis, and bronchitis compared to male patients (white bars), alongside higher rates of antibiotic treatment and influenza vaccination. The graphic effectively summarizes the epidemiological burden of RTIs within these chronic inflammatory disease populations, highlighting gender-specific variations and clinical management patterns.

This medical illustration depicts the human lung architecture from a macroscopic to a microscopic cellular level. The left side features an anatomical diagram showing the hierarchy of the respiratory system: the central trachea bifurcates into the primary bronchi and smaller bronchioles, eventually terminating in alveolar sacs. To the right, high-magnification cross-sectional diagrams detail the micro-architecture and cellular composition of these regions. The Bronchus & Bronchiole section shows a circular lumen lined with three distinct cell types: elongated ciliated cells with hair-like projections, oval-shaped club cells, and circular basal cells. The Alveolus section illustrates the thin, multi-lobed structure of alveolar sacs, primarily composed of Alveolar Type 1 (AT1) cells, which are characterized as thin, flat squamous cells optimized for gas exchange, and Alveolar Type 2 (AT2) cells, which are larger, cuboidal cells responsible for surfactant production. This diagram serves as a physiological and histological reference for the organization of the lower respiratory tract.

A schematic diagram representing a tubular, U-shaped porous sponge designed for gas-liquid exchange, modeled after physiological systems like lung alveoli or blood vessels. The illustration highlights a high-porosity structural wall with a heterogeneous network of interconnected pores of varying sizes. The sponge material is shown in a light, fiber-like texture, with visible blue-tinted gas bubbles or fluid droplets penetrating and diffusing through the porous walls. Both ends of the tubular structure are sealed with a translucent blue material, suggesting the containment of an inner aqueous solution or reaction channel. The educational focus of this visual is the demonstration of gas diffusion mechanisms across semi-permeable, virtually wall-less containers, applicable in biomedical engineering for respiratory support systems or controlled mineralization studies. The diagram illustrates how the hierarchical pore structure increases surface area for efficient gas-liquid interface reactions while maintaining mechanical stability.

This figure illustrates the multiscale engineering approach to mimicking human lung anatomy for tissue engineering. The progression moves from macroscale anatomy to microscale fabrication in three panels. The left panel is a schematic diagram of the pulmonary parenchyma, labeling the bronchiole, pulmonary artery and vein, respiratory bronchioles, alveolar ducts, alveolar sacs, and the capillaries of the interalveolar septa. The middle panel provides a detailed cross-sectional illustration of a single alveolus, identifying the blood-air barrier components: surfactant layer, Type 1 and Type 2 alveolar epithelial cells, interstitial space, endothelial cells, and erythrocytes within the capillary. The right panel is a scanning electron microscopy (SEM) image of a bioengineered 'Lung-MatriGrid®' scaffold. This microfabricated structure features an array of concave, dome-shaped micro-cavities designed to replicate the three-dimensional geometry and dimensions of human alveoli. The scaffold, likely made of polycarbonate, provides a biomimetic surface for co-culturing epithelial and endothelial cells to study the blood-air barrier in vitro.