What are the 7 major organs of the body?

Author: Jeremie Welch  |  Last update: Thursday, April 3, 2025

Organs and organ systems in the human body. The five vital organs in the human body are the brain, heart, lungs, kidneys, and liver. Other organs include the gallbladder, pancreas, and stomach. Organ systems, such as the nervous system, support these organs.

What are the 7 main systems of the human body?

  • Respiratory. System.
  • Renal. System.
  • Nervous. System.
  • Circulatory. System.
  • Digestive. System.
  • Immune. System.
  • Musculature. System.

What are the top 5 most important organs?

The human body contains five organs that are considered vital for survival. They are the heart, brain, kidneys, liver, and lungs. The locations of these five organs and several other internal organs are shown in Figure 10.4.

What are the 12 organs of the body and their functions?

Organs
  • Integumentary (skin, hair, nails)
  • Skeletal (bones)
  • Muscular (smooth, cardiac, and skeletal muscles)
  • Circulatory (heart, arteries, veins)
  • Respiratory (lungs, diaphragm, larynx)
  • Digestive (stomach, intestines, liver)
  • Urinary (kidneys, ureters, bladder)
  • Immune (lymph nodes, bone marrow, thymus)

What are the 10 large major organs in the body?

Based on the weight and the length of the body organ, they are classified as the longest organs in the human body. These organs can be easily seen and are involved in multiple functions. The ten largest organs in the body are – skin, liver, brain, lungs, heart, kidney, spleen, pancreas, thyroid and joints.

5 most important organs in the Human body - Human Anatomy | Kenhub

What is the bloodiest part of the body?

“The scalp is perhaps the most 'bloody' part of the body if injured or cut,” Céline Gounder, a physician, senior fellow at KFF and editor-at-large for public health at KFF Health News, told PolitiFact in an email. “But, in general, the head/neck is the 'bloodiest' part of the body.

What is the least important organ?

Appendix. The appendix is a small blind-ended worm-like structure at the junction of the large and the small bowel. Initially thought to be vestigial, it is now believed to be involved in being a “safe-house” for the good bacteria of the bowel, enabling them to repopulate when needed.

What is the most protected organ system in the body?

The central nervous system, which includes the spinal cord and the brain, is the most protected organ in the human body. It is protected from the external environment by three barriers: skull, meninges, and cerebral spinal fluid (CSF). The meninges are composed by three fibrous connective tissues (Figure 1.6).

What is the biggest organ in the human body?

Summary. Skin is the largest organ of our body. The skin is made up of three main layers: the epidermis, dermis and subcutis.

Which organ is alive after death?

The brain and nerve cells require a constant supply of oxygen and will die within a few minutes, once you stop breathing. The next to go will be the heart, followed by the liver, then the kidneys and pancreas, which can last for about an hour. Skin, tendons, heart valves and corneas will still be alive after a day.

What is the busiest organ in the body?

Additional InformationHeart: The heart is the busiest organ of the human body. The study of the heart and its disease is known as cardiology.

What organ is on your left side?

Some examples of left-side organs include your: Pancreas. Stomach. Spleen.

What is the most important organ in the human body?

The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings-all the things that make us human.

What is the difference between an organ and an organ system?

An organ is a group of tissues that work together for the overall function of the organ, and an organ system is a group of organs that work together to perform a specific function.

What body system allows us to move?

The locomotor system is also known as the musculoskeletal system. It is made up of the skeleton, skeletal muscles, ligaments, tendons, joints, cartilage and other connective tissue. These parts work together to allow your body to move.

What is the weakest bone in the human body?

The weakest and softest bone in the human is the clavicle or collar bone. Because it is a tiny bone which runs horizontally across your breastbone & collarbone, it is simple to shatter.

What is the most powerful part of the body?

If you define strength to mean the ability to exert the most pressure, then the strongest muscle in the human body is the masseter muscle. Of course, you probably call the masseter your jaw muscle. This thick cheek muscle near the back of your jaw opens and closes your mouth when you chew.

What is the most unique organ in the body?

The brain is a unique organ in the human body. In addition to the central role it plays in the nervous system, it is one of the few organs to be protected by “barriers” that can be compared to the walls of a fortress. They protect it from any substance that may alter brain activity.

What organ can you live without?

You'll be surprised as to how much you could lose and still live. You can still have a fairly normal life without one of your lungs, a kidney, your spleen, appendix, gall bladder, adenoids, tonsils, plus some of your lymph nodes, the fibula bones from each leg and six of your ribs.

What is the least important finger?

3The thumb, which is involved in 40–50% of hand function, is the more functionally important of the digits. 3The index and middle fingers are each involved in about 20% of hand function, and are the second most important, with the ring finger being the least important.

What is the most forgotten organ?

Now, 90% of these bacteria live in our gut, so it's almost called a forgotten organ. There are other places, such as skin, lung, reproductive organs, for example, that have a distinct microbiome of their own, and they are very different.

Which part of the human body has no blood?

The cornea is the only part of a human body that has no blood supply; it gets oxygen directly through the air. The cornea is the fastest healing tissue in the human body, thus, most corneal abrasions will heal within 24-36 hours.

What is the most dirty organ in the human body?

Mouth: No amount of brushing or rinsing can help in keeping the mouth clean. Our mouth is a host to more than 600 types of bacteria and these are required for maintaining the pH in the mouth. It is only when there is an imbalance that infection occurs along with bad breath.

What is the hardest part of the human body to heal?

What Part of the Body Heals the Slowest? Ligaments, nerves and wounds in areas with more movement heal the slowest. Injuries to these areas have a longer recovery time because of poor blood circulation and constant motion stress.

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