Which organ is correctly matched with its body system?

• A. Heart – Circulatory system
• B. Kidney – Endocrine system
• C. Stomach – Respiratory system
• D. Lungs – Digestive system

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by identifying the primary function of each organ listed in the problem. For example, the heart pumps blood, the kidney filters waste and regulates fluid balance, the stomach aids in digestion, and the lungs facilitate gas exchange.
2. Step 2: Match each organ to its corresponding body system based on its primary function. For instance, the heart is part of the circulatory system because it pumps blood throughout the body.
3. Step 3: Clarify the role of the kidney. While it has endocrine functions (e.g., producing hormones like erythropoietin), its primary role is in the urinary system for filtering blood and producing urine.
4. Step 4: Evaluate the stomach's function. It is part of the digestive system, not the respiratory system, as it breaks down food and absorbs nutrients.
5. Step 5: Assess the lungs' function. They are part of the respiratory system, not the digestive system, as they are responsible for oxygen intake and carbon dioxide removal during breathing.