Renal failure is the severe impairment or total lack of function. a. liver b. heart c. kidney d. bladder the use of viagra and concurrently can cause hypotension. a. nitroglycerine b. ceftriaxone c. danocrine d. videx the urinary system to maintain the proper ph (acid-base) balance of the a. muscles. b. blood. c. intestines. d. brain. the female is born with about immature sex cells. a. 3-4 million b. 1–2 million c. 5,000 d. 10,000