00:00 / 00:00
Upper respiratory tract infection
0 / 7 complete
0 / 6 complete
That mucus is salty, sticky, and contains lysozymes, which are enzymes that help kill bacteria.
The paranasal sinuses help the inspired air to circulate for a bit so it has time to get warm and moist.
The paranasal sinuses also act like tiny echo-chambers that help amplify the sound of your voice, which is why you sound so different when they’re clogged with mucus during a cold!
At each side of the back of the throat, there is the pair of tonsils, which are small are clumps of lymphoid tissue that act as the body's first line of defense that swallow viruses and bacteria that enter through the mouth or nose.
An upper respiratory tract infection (URTI) is a viral or bacterial infection that affects the nasal passages, sinuses, pharynx, or larynx, typically causing symptoms such as congestion, runny nose, sore throat, cough, and fever. Common URTIs are tonsillitis, pharyngitis, laryngitis, sinusitis, otitis media, and the common cold. The transmission of URTI can occur through direct contact with an infected person or through exposure to airborne droplets from coughing or sneezing. Good hygiene practices and avoiding close contact with infected individuals can help prevent the spread of URTI.
Copyright © 2023 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Cookies are used by this site.
USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.