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.
yes
kidneys
No. Men can't have children. no mater what
Nope...
Don't use marijuana.
If your cat is in perfect health and its movements are regular, then no. Defecating - like humans and all other animals - is not painful unless they are constipated. A constipated cat will often strain in the litter box and even cry out. It can take days for a stool to pass, but this is not advisable to leave it for more than two days as this can be very dangerous. If you believe your cat is in pain trying to pass stool (or even urine), take it to the vet immediately.
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.
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.
The kidneys are a part of the excretory system. They filter toxins out of the blood and pass them to the bladder as urine.
One needs to pass urine after surgery to ensure the kidneys are functioning properly. Failure to pass urine indicates a renal problem.