UNIT 4 Elimination needs Elimination Needs. Introduction Elimination is a fundamental physiological function necessary for maintaining homeostasis in the body. It includes the processes of urinary and bowel elimination. Nursing care focuses on ensuring normal elimination patterns, preventing complications, and assisting patients who have elimination problems. 1. Urinary Elimination Urinary elimination is essential for removing metabolic waste, maintaining fluid and electrolyte balance, and regulating blood pressure. Normal Urinary Elimination Process