NURSING ANM AND GNM

Detailed explanation-1: -For a long time, the human lower airways were considered a sterile environment where the presence of microorganisms, typically revealed by culturing, was interpreted as an abnormal health state.

Detailed explanation-2: -INTRODUCTION. Until recently, it has been generally held that the upper respiratory tract contains abundant bacteria while the lower respiratory tract is sterile when healthy (1–4).

Detailed explanation-3: -The lower respiratory tract consists of the trachea (windpipe), bronchial tubes, and lungs. The bronchial tubes carry air into the lungs and branch into smaller and smaller bronchioles. These end in alveoli (air sacs).