A medusa has a layer of muscles, more or less strongly developed, running in a circular direction on the surface of the subumbrella, the contractions of which are antagonized by the elasticity of the gelatinous substance of the body.
But I'm not feeling any contractions, nor have I ever felt braxton hicks or anything.
You will also receive the hormone oxytocin to help stimulate uterine contractions.
We then started doing deep squats, with hip presses during contractions.
A given cormus may bear one or several nectocalyces, and by their contractions they propel the colony slowly along, like so many medusae harnessed together.