1. Which organ systems are the most important systems for maintaining homeostasis? muscular and digestive nervous and endocrine C. nervous and excretory d. excretory and integumentary a. b. 2. Which condition is maintained by negative feedback? blood pH a. b. C. d. 3. How and where is urea formed from ammonia? the ammonia combines with HCO, in the liver the ammonia combines with uric acid in the bladder the ammonia combines with water in the bladder the ammonia combines with HCO, in the kidney 4. What part of the kidney is represented by A? a. b. C. d. respiration rate blood pressure all of the above a. b. ureter renal medulla renal pelvis d. renal cortex 5. What part of the kidney is considered to be the functional unit? renal medulla a. b. nephron c. glomerulus d Bowman's capsule

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