Fig. 2
From: Response of membrane tension to gravity in an approximate cell model
Schematic diagram of the geometrical model of the deformed vesicle and its force balance in the r-direction: a A geometrical model of the deformed watery sac: a micro-block is taken from the deformed vesicle model. The radius of the micro-block position is r, the height is z, the thickness is dr, the angle of rotation is dβ, and the arc length of the micro-block is ds. b A force diagram of the micro-block, where f is membrane tension