Animal cells do have vacuoles although there is not a fixed amount of them. They are smaller than the large central vacuole in the plant cell and larger in number as well.
A. usually accompanied by dull pain
Hamstring strains are
accompanied by sudden and severe pain during exercise they may possible
include a snapping or popping feeling.
This could vary as any health professional should enjoy working with the population they choose to work with. Despite that, it seems like most likely answer would be children.