Given the question: Fact 1: Urine leaves the body through a sphincter in the process of urination. Fact 2: Urination requires relaxation of the sphincter muscle. Given the two facts above, answer the question "What does the process of urination require?" with the following options: - aerobic capacity - relaxation of muscles - the looseness of soil - sunlight - air - metabolic reaction - blood - Converting waste.
The answer is:
relaxation of muscles