Multiple Choice
Which of the following is NOT one of the three main regions of a human kidney?
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25. The Urinary System
Introduction to the Urinary System
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What is the main purpose of the urinary system?
A
To remove waste products from the blood and regulate fluid and electrolyte balance
B
To produce hormones that control blood sugar levels
C
To break down food and absorb nutrients
D
To transport oxygen throughout the body
Verified step by step guidance1
Step 1: Begin by identifying the primary function of the urinary system. The urinary system is responsible for filtering blood to remove waste products, such as urea, creatinine, and excess ions, and excreting them in the form of urine.
Step 2: Understand the secondary roles of the urinary system. It helps regulate fluid balance by controlling the volume of water excreted and maintains electrolyte balance by adjusting the levels of sodium, potassium, and other ions in the blood.
Step 3: Compare the functions of the urinary system with the other options provided. For example, producing hormones that control blood sugar levels is a function of the endocrine system (e.g., insulin from the pancreas), not the urinary system.
Step 4: Eliminate options that are unrelated to the urinary system. Breaking down food and absorbing nutrients is the role of the digestive system, and transporting oxygen throughout the body is the role of the circulatory system.
Step 5: Conclude that the correct answer is the option that aligns with the urinary system's primary purpose: 'To remove waste products from the blood and regulate fluid and electrolyte balance.'
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