A. Multiple myeloma is a malignant, clonal disorder of plasma cells that originates in the bone marrow. Itâs a relatively common disorder, accounting for 1% of all malignancies and 10% of all hematologic malignancies in adults.
torsion, n 1. , motion or state of torque in which one end of an anatomical component is twisted about its longitudinal axis as the opposite end is either immobile or moves in the opposite direction.
The adult gastropod ends up configured in such a way that its body and internal organs are twisted and the mantle and mantle cavity are above its head. It should be noted that torsion involves the twisting of the gastropod's body, it has nothing to do with the coiling of the shell (which we'll consider next).