Many fluid-conveying vessels in the human body are elastic and can undergo significant flow-induced deformations, making physiological fluid mechanics a rich source of large-displacement fluid-structure interaction problems. The aim of this chapter is to demonstrate the effects of wall elasticity on three canonical internal flows that arise in physiological applications. We start in Section 8.2 by discussing low-Reynolds-number flows in the Starling resistor (the elastic-walled equivalent of Hagen–Poiseuille flow) as a generic model for single-phase flows in elastic vessels. This problem requires the coupled solution of the Stokes equations and the equations of large-displacement elasticity. In Section 8.3 we extend...