In this specimen of lung, the prominent dark-reddish structures are blood vessels filled with blood. (Histological preparation often washes away blood, rendering blood vessels much less conspicuous.) Also, this lung is not fully inflated so alveolar walls appear somewhat wrinkled.
Comments and questions: firstname.lastname@example.org
SIUC / School
of Medicine / Anatomy / David
Last updated: 29 July 2003 / dgk