Fig. 4

Histomorphometry of pulmonary vessels and heart. Normoxic and hyperoxic study groups are illustrated with white and grey box plots, respectively. a–d Count of pulmonary vessels (n = 8 + 8), α-SMA content in the medial wall of the pulmonary arterioles (n = 7 + 8), right-to-left ventricle wall thickness ratio (n = 3 + 6), cardiomyocyte cross-sectional area (n = 7 + 8) in normoxia and hyperoxia, respectively. Data are expressed as vertical box plots with median, 10th, 25th, 75th, and 90th percentiles. Asterisk displays a significant difference between study groups, p < 0.05