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Which of the following is the largest organ in the human body?
Liver
Skin
Lungs
Heart
Skin
The skin (integumentary system) is the largest organ of the human body by both surface area and weight. It covers the entire external surface of the body and serves as the primary protective barrier against external pathogens.
The skin (integumentary system) is the largest organ of the human body by both surface area and weight. It covers the entire external surface of the body and serves as the primary protective barrier against external pathogens.
Think of the skin as a sophisticated, self-healing climate-controlled protective casing for a high-tech machine, wrapping every internal component to shield it from external hazards.
SA=тИСAiтАЛ тАФ Surface area calculation principle representing total area SA as the sum of components AiтАЛ
The skin functions as a complex organ system composed of three primary layers: the epidermis, dermis, and hypodermis. It maintains homeostasis by regulating body temperature through sweat production (H2тАЛO evaporation) and vasodilation, while providing sensory input via specialized receptors and protecting against ultraviolet radiation and physical trauma.
The skin accounts for approximately 15% of the total adult body weight.
The average surface area of an adult human skin is approximately 1.5 to 2.0 square meters (m2).
The skin is the primary site of Vitamin D synthesis when exposed to sunlight (UVB radiation).
The liver is the largest internal organ, whereas the skin is the largest organ overall.
Protects underlying tissues from dehydration and mechanical injury.
Acts as an excretory organ for salts and urea.
Facilitates immune surveillance through Langerhans cells.
Susceptible to environmental pathogens and UV-induced DNA mutations.
Chronic exposure leads to aging and potential malignant transformation (e.g., melanoma).
Transdermal drug delivery systems.
Dermatological diagnostics and skin grafting.
Average skin mass: 3 to 5 kilograms in an average adult.
Option A (Liver) is the largest internal organ, but it is smaller than the skin in terms of surface area and total weight.
Option C (Lungs) are vital for respiration but possess a smaller mass and total external surface area than the skin.
Option D (Heart) is a muscular pump, significantly smaller than both the liver and the skin.
B is correct тАФ The skin is the largest organ of the human body, providing a comprehensive protective barrier and surface area for homeostasis.
Always distinguish between 'largest organ' (Skin) and 'largest internal organ' (Liver) to avoid common trick questions in competitive exams.
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