Final answer:
Micturition is the process of eliminating urine from the body, involving the micturition reflex that signals the need to urinate. It is a part of the overall function of the urinary system, which filters blood and maintains water and electrolyte balance.
Step-by-step explanation:
Micturition is another term for the elimination of urine. The micturition reflex is an interplay of both involuntary and voluntary actions controlled by the internal and external urethral sphincters, and it is responsible for signaling the need to urinate. As the urinary bladder fills, the urge to void becomes harder to ignore, and once the bladder volume approaches 300 to 400 mL, micturition will occur, leading to the elimination of urine from the body.
The urinary system is crucial in this process as it filters waste products from the blood, specifically urea, through the kidneys, which then excrete the waste via urine. The urine moves from the kidneys through the ureters to the bladder, then finally to the outside of the body via the urethra. The kidneys not only filter the blood but also help maintain water and electrolyte balance.