Figure 7
From: Viscoelastic behaviour of human mesenchymal stem cells
Schematics of theoretical model of the micropipette aspiration test (Adapted from [17]). (A) A model cell is being sucked, under a pressure ΔP, into a micropipette with inner and outer radius a and b, respectively. The portion of the cell inside the micropipette is L. r and z are coordinates fixed on the cell at the tip of the micropipette. (B) Viscoelastic model of the cell: a spring with elastic constant k1 is connected in parallel with a spring (elastic constant k2) and a dashpot (apparent viscosity μ) connected in series.