Urine, or pee, is passed out of the body through the urethra.
The Journey of Urine: From Kidneys to Urethra
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Kidney Production: The kidneys filter waste products from the blood, creating urine. [Source: Nemours KidsHealth, https://kidshealth.org/en/teens/kidneys.html] This process involves the nephrons and renal tubules, where urea, water, and other waste substances combine to form urine. [Source: Johns Hopkins Medicine, https://www.hopkinsmedicine.org/health/wellness-and-prevention/anatomy-of-the-urinary-system]
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Ureter Transport: From the kidneys, urine travels through the ureters – two tube-like structures – to the bladder. [Source: Provided text, Nemours KidsHealth, https://kidshealth.org/en/teens/kidneys.html]
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Bladder Storage: The bladder, a muscular sac in the lower abdomen, stores urine until it's time to urinate. [Source: Provided text, Nemours KidsHealth, https://kidshealth.org/en/teens/kidneys.html] This storage capacity is approximately 1.7 liters per day. [Source: InformedHealth.org, https://www.ncbi.nlm.nih.gov/books/NBK279384/]
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Urethral Excretion: When you urinate, the urine exits the bladder and leaves the body through the urethra. [Source: Provided text, Nemours KidsHealth, https://kidshealth.org/en/teens/kidneys.html] This is another tube-like structure. The urethra's opening is where urine is passed. [Source: MedlinePlus, https://medlineplus.gov/ency/article/003145.htm] The process involves the relaxation of muscles around the urethra, allowing urine to pass. [Source: National Institute on Aging, https://www.nia.nih.gov/health/bladder-health-and-incontinence/urinary-incontinence-older-adults] Urinary incontinence occurs when urine is unintentionally passed. [Source: NHS, https://www.nhs.uk/conditions/urinary-incontinence/symptoms/] Kidney stones, for example, may pass through the urinary tract and exit the body in the urine. [Source: UpToDate, https://www.uptodate.com/contents/kidney-stones-in-adults-beyond-the-basics/print]
In summary: Urine is passed out of the body through the urethra after being produced in the kidneys, transported through the ureters, and stored in the bladder.
