Keywords: Fluorescent image fibroblast.jpg en This image shows a normal fibroblast a type of cell that is common in connective tissue and frequently studied in research labs This cell has a healthy skeleton composed of actin red and microtubles green Actin fibers act like muscles to create tension and microtubules act like bones to withstand compression http //images nigms nih gov/index cfm event viewDetail imageID 3617 NIGMS Open Source Image and Video Gallery James J Faust and David G Capco 2011-04-26 PD-USGov Check categories 2015 July 6 Microtubules |