@theanatomylab7: COVID-19 doesn't start in your lungs—it often begins inside your nose. The first stage of a COVID-19 infection often begins in the nasal cavity. SARS-CoV-2 can attach to ACE2 receptors on the surface of certain epithelial cells, allowing the virus to enter those cells and begin replicating. Meanwhile, tiny hair-like cilia continue moving mucus to help trap and remove particles, while nearby immune cells constantly patrol for potential threats. #COVID19 #SARSCoV2 #Coronavirus #RespiratorySystem #ImmuneSystem

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Monday 20 July 2026 14:20:47 GMT