AP BIOLOGY

Detailed explanation-1: -Assertion :Tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings. Reason: These rings of cartilage make the wall non-collapsible.

Detailed explanation-2: -What does cartilage do? Cartilage protects your bones and joints. It surrounds the ends of your bones and cushions the spaces in your joints where bones meet.

Detailed explanation-3: -In the main bronchi, the cartilage forms C-shaped rings like those in the trachea, while in the smaller bronchi, hyaline cartilage is present in irregularly arranged crescent-shaped plates and islands. These plates give structural support to the bronchi and keep the airway open.

Detailed explanation-4: -Tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings.

Detailed explanation-5: -Cartilage is what keeps the bronchi from collapsing during inhalation and exhalation. While the trachea and upper bronchi contain C-shaped cartilage, the smaller bronchi have “plates” of cartilage.