Xylem vessels (conducting and support): Conducting cells called tracheids and the tubles called vessels, some cells lose their end walls, their cytoplasm and their nucleus, forming rollow tube carrying solution from root up the stem through veins of leaves. Side walls are thickened with lignin to support plant.
3- Red blood cells (transport): a. No nucleus b. Cytoplasm is red as it contains haemoglobin (red pigment) c. large surface area. lung
Hb + O2 HbO2 tissues