1. What is part of the urinary system?: Answer kidneys, ureters, urinary bladder, urethra 2. -Maintain composition and volume of body fluids -filter and excrete blood constituents not needed;retain those that are needed -excrete waste product (urine): Answer Kidneys and ureters 3. remove the end products of metabolism and regulate fluidbalance: Answer nephrons 4. Urine from the nephrons empties into the : Answer Kidneys 5. -Smooth muscle sac -serves as a reservoir for urine: Answer Bladder 6. The bladder is composed of three layers of muscle tissue called what?: Answer detrusor muscle 7. Guards opening between urinary bladder and urethra: Answer Sphincter 8. Urethra conveys urine from __________________to ______________________: - Answer bladder; exterior of body