The process of passing out urine is called _________.

Urine:

1. Kidneys filter the blood and eliminate nitrogenous waste, salts and excess water in the form of a liquid called urine.

Micturition:

1. The passage of urine to the outside of the body through the urethra is called micturition.
2. The central nervous system transmits the signals which initiate the contraction of muscles of the urinary bladder which cause the release of urine.

Final answer: The process of passing out urine is called micturition.