Certification Board for Sterile Processing and Distribution (CBSPD) Sterile Processing Technician Practice Exam

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Which of the following is recognized as the largest organ of the human body?

  1. Heart

  2. Liver

  3. Skin

  4. Lung

The correct answer is: Skin

The skin is recognized as the largest organ of the human body due to its extensive surface area, which can measure around 18 square feet in adults, depending on size. It serves multiple critical functions, including protection against pathogens, regulation of body temperature, sensation, and serving as a barrier to prevent water loss. The skin's various layers—epidermis, dermis, and hypodermis—work together to provide these protective and regulatory functions. In contrast, while the heart, liver, and lungs are vital organs with specific essential roles in the body's functioning, their size and surface area do not compare to that of the skin. The heart pumps blood, the liver processes nutrients and detoxifies the blood, and the lungs facilitate gas exchange, but none of these organs covers more area than the skin. Thus, the skin's size and multifunctionality establish it as the largest organ in the body.