why does the urinary system work with the small intestine?

How do valves prevent blood from flowing in the wrong direction? How can you tell if one is faking a seizure? How the real cause of Stomach ulcers was discovered? Can you exercise with thick blood? What is the colour of blood in human body? What do you do if a hen has a broken toe? How can pet scans determine the location of a tumor? What do we call the dirt inside your nose? Cpap machine can add flavors to the waters? What causes crystallization in the eye? What happens after the virus has been taken up by the cell? Is ringworm catching? Why do you not like being left alone? Why do breasts still bounce in bras when walking? Nose bleed after hitting head in toddler? How does the brain tell the heart to pump? Is bird flu naked or enveloped? What should the Cholesterol level for a woman 60 years of age? What the minimum and maximum time of menstruation cycle? Why is depression often mistaken for dementia?