The human body is a complex system composed of various organs, each serving a unique and vital function. These organs work together in harmony to maintain the body's health and allow it to perform everyday tasks, from breathing and moving to thinking and feeling. There are about 75 to 80 organs in the human body, and these organs are categorized into different systems such as the digestive system, circulatory system, nervous system, and so on.
But when we talk about "what is the biggest organ in the human body" or "what's the biggest organ in the human body," there is a clear answer.
An organ is defined as a group of tissues working together to perform specific functions in the body. Every organ in the human body, whether it’s the largest organ in human body or the smallest organ in human body, has a critical role to play. Each of these organs consists of specialized cells that come together to ensure that the body functions smoothly.
For instance, the heart is a human organ made up of muscle tissue, and its function is to pump blood throughout the body. Similarly, the liver, which is one of the internal organs of human body, carries out metabolic processes that are crucial for survival.
The human body contains many vital organs. Below is a table that lists some of the major organs and their approximate weight, location, and basic functions.
| Organ | Approximate Weight | Location | Main Functions |
| Skin | 2 to 4 kg | Covers the entire body | Protects, regulates temperature, provides sensory input |
| Brain | 1.4 kg | Skull (Cranial Cavity) | Controls thought, memory, emotions, and motor functions |
| Heart | 250 to 350 grams | Chest (Thoracic Cavity) | Pumps blood throughout the body, supplying oxygen and nutrients |
| Lungs | 1.1 to 1.3 kg (both) | Chest (Thoracic Cavity) | Responsible for breathing and oxygen exchange |
| Liver | 1.5 kg | Upper right abdomen (below the rib cage) | Detoxifies, produces bile, stores energy |
| Kidneys | 150 grams each | Lower back (on both sides of the spine) | Filters waste from blood, regulates fluid balance |
| Stomach | 1 kg | Upper left abdomen | Digests food, breaks it down with acid and enzymes |
| Intestines | 2.5 to 3 meters (length) | Abdomen (coiled structure) | Absorbs nutrients and water from food |
| Spleen | 150 grams | Left side of abdomen | Filters blood, removes old red blood cells, supports immune system |
| Pancreas | 80 to 100 grams | Behind the stomach | Produces insulin and digestive enzymes |
Also Check: GK Questions on Human Body
When you ask, "What is the biggest organ in human body?" the answer is skin. The skin is the largest organ in human body, and it plays a vital role in protecting the body from external threats. In fact, the skin is so essential to our survival that it not only serves as a barrier against harmful bacteria and UV radiation but also helps regulate body temperature and eliminate waste through sweat.
The skin weighs about 2 to 4 kg and covers an area of approximately 20 square feet in adults, making it the biggest organ in the human body. The largest organ in human body serves multiple functions, including acting as a sensory organ that detects touch, pressure, pain, and temperature. Furthermore, it is vital for synthesizing vitamin D, which is crucial for bone health.
So, if you're wondering, "What is the biggest organ in the human body?", it is undoubtedly the skin.
After the skin, the second largest organ in the body is the liver. The liver is an internal organ of the human body and plays a central role in digestion and metabolism. Weighing about 1.5 kg in an adult, the liver is responsible for over 500 different functions, including detoxifying the blood, producing bile, and storing nutrients and vitamins.
The liver also plays a crucial role in regulating blood sugar levels by storing and releasing glucose as needed. It is one of the few organs that can regenerate if damaged, making it a remarkable part of the human body organs system.
The liver is one of the most important human organs and, after the skin, holds the title of the second largest organ in the body.
The Human brain is another crucial human organ that controls thought processes, movement, memory, and even the functioning of other organs. Weighing about 1.4 kg, the brain is the largest internal organ in the human body. It is housed within the skull and is responsible for nearly all of the body’s activities, from regulating involuntary functions like breathing to controlling voluntary actions such as walking.
While the brain is one of the most important organs, it is not the biggest organ in human body in terms of size, but in terms of complexity and function, it is unparalleled.
Do Check: Body Parts Name in English and Hindi
The lungs are another important set of human body organs and are critical for respiration. Humans have two lungs, located in the chest cavity, which are essential for the intake of oxygen and removal of carbon dioxide. The total weight of the lungs is about 1.1 to 1.3 kg, and they have a combined surface area of about 70 square meters.
The lungs may not be the biggest organ in the human body, but they are among the largest in terms of functionality, supporting the respiratory system by enabling gas exchange.
Thus, the lungs play a crucial role in maintaining life, ensuring the oxygen needed by the body reaches the bloodstream, which is vital for the survival of all human organs.
The heart is another vital human organ that deserves attention. It may not be the biggest organ in human body, but it is undoubtedly one of the most critical. The heart is responsible for pumping blood throughout the body, supplying oxygen and nutrients to tissues and organs.
Weighing about 250 to 350 grams, the heart is located in the chest, slightly left of the center. It pumps about 70 milliliters of blood with each beat and circulates around 5 liters of blood per minute.
Despite not being the biggest organ in human body, the heart is essential for sustaining life, circulating blood that supports every human body organ.
While we often focus on the largest organs, it's worth noting the smallest organ in the human body—the pineal gland. This tiny organ, located in the brain, is responsible for producing melatonin, a hormone that regulates sleep patterns. Though small, the pineal gland plays an essential role in the human body's circadian rhythm.
The human body is surprisingly resilient and can function without several organs. While some organs are essential for survival, there are others that you can live without, or can survive with only one of them. Here’s a list of organs that are not absolutely necessary for survival:
Even though the body can survive without some of these organs, losing any of them often requires adjustments, and in many cases, medical care or lifestyle changes.
There are generally 79 organs in the human body, including both internal and external organs. These include vital internal organs like the heart, lungs, liver, and kidneys, as well as external organs like the skin.
The 78 organs in the human body include major organs like the brain, heart, kidneys, liver, and stomach. It also includes specialized organs such as the pineal gland, spleen, gallbladder, and various parts of the skin, muscles, and sensory organs like the eyes and ears. These organs perform specific functions essential for survival and bodily functions.
The liver is the largest internal organ of the human body. It plays a crucial role in detoxifying the blood, producing bile for digestion, and storing nutrients.
The human body has 5 sense organs, which include:
Eyes (for sight)
Ears (for hearing)
Nose (for smell)
Tongue (for taste)
Skin (for touch)
The skin is the largest organ in the human body. It is classified as an external organ and covers the entire body, serving as a protective barrier.
The liver is the second largest organ in the body. It is an internal organ that performs essential functions like detoxifying the blood and producing bile for digestion.
The smallest organ in the human body is the pineal gland. It’s located in the brain and regulates sleep patterns by producing melatonin.
Internal organs of the human body include the heart, liver, lungs, kidneys, stomach, intestines, brain, and more. These organs are vital for survival.
The lungs are considered the third largest organs in the human body, weighing about 2.45 pounds on average.
The strongest muscle, based on weight, is the masseter, used for chewing. Other strong muscles include the tongue, heart, and gluteus maximus.
The femur, or thigh bone, is the longest and strongest bone in the human body.
The human body has approximately 600 muscles and 206 bones.
No, teeth are not classified as bones. Although they are hard like bones, teeth are primarily made of dentin and enamel.
The stapes, located in the middle ear, is the softest and lightest bone in the human body.
The femur is the hardest bone to break due to its strength and location in the thigh.
