ANATOMY

Detailed explanation-1: -The major passages and structures of the lower respiratory tract include the windpipe (trachea) and within the lungs, the bronchi, bronchioles, and alveoli. Deep in the lungs, each bronchus divides into secondary and tertiary bronchi, which continue to branch to smaller airways called the bronchioles.

Detailed explanation-2: -The upper respiratory tract includes the nose, pharynx, and larynx. The lower respiratory tract consists of the trachea, bronchial tree, and lungs. These tracts open to the outside and are lined with mucous membranes.

Detailed explanation-3: -pharynx is not a part of the lower respiratory tract. The upper respiratory tract consists of all the structures that are above the larynx. The pharynx acts as a common pathway between the nose, the mouth and the larynx.

Detailed explanation-4: -The lower respiratory tract (or system) is found in the lower throat and thoracic cavity and includes the trachea below the larynx, bronchial passageway, and lungs. The trachea is the cartilaginous pipe that air travels through between the upper and lower respiratory tracts.

Detailed explanation-5: -The major passages and structures of the upper respiratory tract include the nose or nostrils, nasal cavity, mouth, throat (pharynx), and voice box (larynx). The respiratory system is lined with a mucous membrane that secretes mucus. The mucus traps smaller particles like pollen or smoke.