What is the branchlike extensions found in the lower respiratory system called

Using the drop-down menus, identify the parts of the lower respiratory system from the descriptions below.

The lungs  are enclosed in a membrane called the pleura.

The bronchioles are branch-like extensions found in the lower respiratory system

Identify the structures labeled in the diagram to the right.

alveoli  Label A

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answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]