Tracking flight trajectory of evaporating cough droplets

The ongoing COVID-19 pandemic has led many researchers to study airborne droplet transmission in different conditions and environments. The latest studies are starting to incorporate important aspects of fluid physics to ...

A feline fungus joins the new species list

(Phys.org) —A new species of fungus that causes life-threatening infections in humans and cats has been discovered by a University of Sydney researcher.

New lung 'organoids' in a dish mimic features of full-size lung

New lung "organoids"—tiny 3-D structures that mimic features of a full-sized lung—have been created from human pluripotent stem cells by researchers at Columbia University Medical Center (CUMC). The team used the organoids ...

Phage therapy shown to kill drug-resistant superbug

Scientists from the University of Liverpool's Institute of Infection and Global Health have shown that phage therapy could offer a safe and effective alternative to antibitotics in the treatment of cystic fibrosis lung infections.

Vast forest fires in Indonesia spawn ecological disaster

For farmer Achmad Rusli, it was a season of smoke: Ten weeks without sunlight for his oranges, guavas and durians, thanks to deliberately set forest fires that burned a chunk of Indonesia the size of New Jersey.

Examining vaping particle size and deposition

E-cigarette use is rising, particularly among young adults and teens. Recent illnesses and deaths attributed to vaping have caused intense scrutiny of the chemicals in e-liquids and vapor, but little is known about the size ...

NTU scientists invent superbug killers

The superbugs have met their match. Conceived at Nanyang Technological University (NTU), it comes in the form of a coating which has a magnetic-like feature that attracts bacteria and kills them without the need for antibiotics.

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Respiratory tract

In humans the respiratory tract is the part of the anatomy that has to do with the process of respiration.

The respiratory tract is divided into 3 segments:

The respiratory tract is a common site for infections. Upper respiratory tract infections are probably the most common infections in the world.

Most of the respiratory tract exists merely as a piping system for air to travel in the lungs; alveoli are the only part of the lung that exchanges oxygen and carbon dioxide with the blood.

Moving down the respiratory tract starting at the trachea, the tubes get smaller and divide more and more. There are estimated to be about 20 to 23 divisions, ending up at an alveolus.

Even though the cross-sectional area of each bronchus or bronchiole is smaller, because there are so many, the total surface area is larger. This means there is less resistance at the terminal bronchioles. (Most resistance is around the 3-4 division from the trachea due to turbulence.)

This text uses material from Wikipedia, licensed under CC BY-SA