What Are the Different Types of Organs in the Human Body?

The skin is the largest organ in humans.
The heart pumps blood to every part of the body.
All of the internal organs, like the liver, heart, kidneys and lungs, are vital for the body to work properly.
The torso houses many of the body's organs.
Several different organ systems keep the body functioning normally.
The human brain controls all the actions of the body.
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  • Written By: Lauren Romano
  • Edited By: Heather Bailey
  • Last Modified Date: 17 January 2015
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From eyes to skin and brain to heart, there are various types of organs in the human body. Eyes are the second most complex in the body. The brain is the third largest major organ and is also the most complex. Skin is the largest organ of the body while the heart is responsible for pumping blood to every part of the body and can do just that in less than a minute. Other internal organs, including the stomach, liver, lungs and kidneys, are vital for the body to work properly.

Eyes are the second most complex organs in the body. Humans blink approximately 10,000 times per day, or on average, about 12 times each minute. The eyes start to develop about 26 weeks after conception. It's believed that the eyes focus on 50 thing per minute. Although the eye can not yet be transplanted into another person, the cornea, which is the front part of the eye, can be.

The adult human brain is responsible for controlling all the actions of the body. It weighs about 3 pounds (1.38 ounces) and contains more than 100,000 miles of blood vessels. The cerebrum is what makes up 85 percent of the total weight; the brain as a whole is comprised of about 75 percent water. It's the most complex and the third largest of the organs in the human body. The brain can feel no pain due to a lack of pain receptors.


Skin is the largest of the organs in the human body and weighs more than twice as much as the brain. Depending on the person, the average weight of the skin is about 8 pounds (approximately 3.6 kilograms). It's responsible for protecting the body from a variety of dangers including sunlight and chemicals. The skin is comprised of three layers: the base layer is the subcutis, the middle layer is the dermis, and the outer layer is the epidermis.

The heart is the fifth largest of the organs in the human body and is responsible for pumping blood to every part of the body, which it can do in less than a minute. The fist-sized organ is on an angle; it's located behind the sternum and slightly to the left side of the body. It beats about 100,000 times a day, or about 40 million times a year. There are four chambers that make up the heart two ventricles and two atria.

A variety of other internal organs are vital for the human body to work properly. The stomach, which is located between the small intestine and esophagus, is responsible for processing food and moving it along. The liver, located on the right of the body under the ribs, is the second largest organ next to the skin and the largest internal organ; it's responsible for making bile, handling nutrients from food, and removing toxins from the body. Lungs, which are located in the center of the chest, bring oxygen into the body and remove carbon dioxide. Two kidneys are located in the middle of the back below the rib cage and are responsible for taking water and waste from the blood in order to form urine.



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Post 4

@KoiwiGal - I was always surprised when they classified the skin as an organ, to be honest. When I was a kid I thought organs were basically just the individual bits that did stuff in the body, and that skin and bones and muscles were more like the packaging that just held it all together.

But skin is actually pretty complex stuff. I did a biology paper a few years ago and I can remember being kind of blown away by how many different functions the skin has.

So, anyway, I guess it depends on what your definition of an organ is. The cells in our guts do actually have quite a complex role in our bodies. I'd say they were more complex than even the eye, or possibly anything except the brain.

Post 3

@browncoat - I don't know if that should be considered to be an organ though. I mean, you can recognize that it is vital to the human body, but oxygen is vital to our survival as well and we don't call the atmosphere an organ.

I guess it does raise the question of at what point we consider a cell to be part of the human body though.

Post 2

I read an article recently where the author basically said that we have a larger "organ" than skin in our body, and that it's the bacterial ecosystem that lives in our gut. Apparently it has a hundred times more cells than the rest of our body, they are just very small.

And, according to the article, doctors and researchers are realizing more and more often that fixing problems with that ecosystem can fix a lot of different conditions. They had one guy who they basically saved from the symptoms of MS with a fecal transplant.

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