In order to prevent a lung from collapsing, the intrapleural pressure must be __________________ when compared to atmospheric pressure.

Cecum 2.jpg Name the highlighted region of the organ.  [BLANK-1]

Slide52.jpeg Name the parts of the tracheobronchial tree marked by the black arrows. [BLANK-1]

Esophageal hiatus 2.jpg Name the highlighted opening.  [BLANK-1]

Tooth dentin.jpg Name the structural material of the tooth that is highlighted in green. [BLANK-1]

All of the following structures of the nasal complex are part of the ethmoid bone, except

Slide61.jpeg This is a sample of the tracheal wall.  Give the letter that marks a layer that consists primarily of hyaline cartilage.

Slide18.jpeg Name the bone that contains the cavity marked by the red arrow.  [BLANK-1]

All alveoli within a single sac receive air from the same respiratory bronchiole.

Identify something in Unit 2 that you found interesting, surprising or compelling, and suggest one thing that you would have liked to learn more about during this historical period.