Mucus droplets. Coloured scanning electron micrograph (SEM) of droplets (red) of mucus in the trachea (windpipe). The droplets are seen on epithelial cells. Mucus is a substance secreted by many interior epithelial surfaces,such as the lining of the lungs,the nasal passages,and the digestive and reproductive systems. Mucus consists of various substances depending on location,but generally has a lubricating function. The trachea is the tube that leads from the mouth to the lungs,and the mucus traps airborne pathogens and particles | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gschmeissner, Steve |
Taille de l’image : | 3376 px × 4075 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |