Confinement is the physics phenomenon that quarks cannot be isolated. The color-charged quarks are confined with other quarks by the strong interaction to form pairs or triplets so that the net color is neutral. The force between quarks increases as the distance between them increases, so no quarks can be found individually.
... in both sexes, to pass urine to the outside, and also a reproductive function in the male, as a passage for sperm.
The external urethral sphincter is the skeletal ...