Final answer:
2. Urinary catheterization is the medical procedure where a flexible tube is inserted through the urethra to the bladder to drain urine, distinct from urinary retention, urinary endoscopy, and urinary tract infection.
Step-by-step explanation:
Urinary Catheterization Defined
When a flexible tube is inserted through the urethra to the bladder to drain urine, it is called 2. urinary catheterization.
This medical procedure allows for the direct drainage of the urinary bladder when a patient is unable to urinate naturally due to various conditions such as urinary retention, obstruction, surgery, or other medical circumstances.
It involves inserting a catheter through the urethral opening up into the bladder, providing a path for urine to leave the body.
Other terms mentioned in the question, such as urinary retention, urinary endoscopy, and urinary tract infection, are related to the urinary system but refer to different conditions or procedures.