kidneys
Not necessarily. Urine tests and blood tests measure different things and have different detection windows. Passing a urine test does not guarantee passing a blood test, as they are used to detect different substances and levels of substances in the body.
No. Men can't have children. no mater what
Blood in the urine of either men or women can be caused by infections that involve the kidneys, the ureters, the bladder or trauma to the penis (in men). It can also be caused by kidney stones as they pass through the ureters. If urine is visible to the eye then it's called Gross Hematuria. If it not visible to the eye and is only seen through the microscope then it's called Microhematuria.
Nope...
Don't use marijuana.
Blood in your urine is not dangerous per se but requires evaluation, especially when accompanied with pain during urination. This could be something as common as a Urinary Tract Infection or as painful as a Kidney Stone.
yeah. shouldnt have taken it.
blood, saliva , urine screens ,Yes (approx detection time in urine is 5-10 days)
If you don't do drugs, you will pass the urine test.
allows blood flow to pass and sperms to enter
Capillary. The thin walls allow diffusion of materials to pass from the blood flow into the nephron.
No. Blood clots in urine signify something more serious than a mere infection. See your doctor about it, and s/he'll figure out what exactly is going on.