The urinary bladder is comprised of nerves, muscles, and connective tissue. The most important muscle in the bladder is the detrusor muscle. In normal circumstances, when the bladder fills with urine, it can stretch to hold the urine.
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Raw dog food diets are controversial. But the popularity of the diets -- which emphasize raw meat, bones, fruits, and vegetables -- is rising. Racing greyhounds and sled dogs have long eaten raw food diets.