11 Organ Systems | Their Important Functions in the Human Body

The human body has many organs located in different parts of the body. These organs form 11 organ systems that play an important role in body physiology.

The 11 organ systems include

  1. Skeletal system
  2. Muscular system
  3. Respiratory system
  4. Cardiovascular system (Circulatory system)
  5. Digestive system
  6. Nervous system
  7. Endocrine system
  8. Reproductive system
  9. Urinary system
  10. The lymphatic system (Humeral system)
  11. Integumentary system

As you might have known, an organ is formed from a group of tissues. These tissues are, in turn, are formed from a group of cells.

involved in a common function by forming an anatomical structure. This anatomical structure is called an organ.

The tissues in the organ are made up of different types of cells.

A set of organs is referred to as an organ system due to its distinct physiological goals in the body.

For example, the digestive system is an organ system comprising organs like the stomach, esophagus, buccal-cavity, intestine, rectum, pancreas, liver, etc. They are all concerned with one important physiological function, namely digestion. If one of the organs is disturbed, then the whole function of digestion is in trouble. So these organs are perfectly interlinked and connected.

In most cases, every organ in the organ system has only one specific physiologic function.

But some organs may be a part of one or more organ systems. For example, the liver is a part of the digestive system but also plays a prominent role in the excretion system. It helps metabolize drugs and other waste from the body through urine.

The organ systems are similar in terms of function and anatomy, starting from amphibians to higher animals. The different organ systems in the human body include.

Details on Organ Systems with Functions

1. Skeletal system

This system consists of bones in the body. These bones are made of bone cells and cartilage cells, which are hardened.

11 Organ Systems-skeletal system chart
Image by: wiki commons

They provide the body a proper shape, frame, and support to other organs. In places, the bony compartment, like the skull and thorax, also protects the essential organs like the brain, heart, lungs.

This system is also flexible and movable at places called joints. These joints help in the body movements in coordination with skeletal muscles.

2. Muscular system

This system is made up of muscles that are responsible for movements. There are three types as skeletal, cardiac, and smooth muscles. 11 Organ Systems-muscularsystem

Skeletal muscles help in moving the body from one place to another. Functions like walking, running, moving, lifting, bending are possible due to skeletal muscles.

On the other hand, the cardiac muscles in the heart help in blood pumping. It forces the blood to flow through the arteries such that it reaches the deep and remote areas of the body.

While the smooth muscles are present in other organs like the intestine, uterus, urinary bladder, etc. These muscles bring about movement within the body to aid physiology.

3. Respiratory system

The respiratory system helps to trap the atmospheric oxygen from the air and supply it to the body.

11 Organ Systems-respiratorysystem

The respiratory system comprises the respiratory tract and diaphragm. The tract includes the nose, larynx, bronchi, and lungs.

The oxygen is absorbed into the blood from the lung alveoli and carried away. In the body, it helps to generate energy through the oxidation of glucose in the mitochondria.

Besides, the respiratory system helps in making sounds, excretion (alcohol), and also metabolism.

4. Cardiovascular system

The cardiovascular system is one that circulates the blood in the body.

11 Organ Systems-cardiovascular system

It comprises blood, blood vessels (arteries, veins & capillaries), and a heart.

The main functions of this system are to

  1. maintain a uniform temperature,
  2. Supply oxygen and nutrition to cells and tissues
  3. To collect waste matter
  4. To carry hormones for action on target organs.
  5. To facilitate body defense.

5. Digestive system

This system is meant to break down the food and absorb nutrients from it into the blood.

It consists of the stomach, esophagus, intestine, mouth, teeth, throat, rectum, and anus. It is the only route through which food can gain entry into the body.

The food is breakdown into smaller carbohydrates like disaccharides, amino acids, and fatty acids for easy absorption into the body.

6. Nervous system

This is a master system that controls all other organ systems of the body.

11 Organ Systems-nervous systemIt regulates the whole-body physiology.

It comprises the brain, spinal cord, sympathetic nervous system, and also the parasympathetic nervous system.

It stimulates the release of hormones when needed. It regulates the body movements through muscles, controls respiration, heartbeat, etc.

7. Endocrine system

This system is complementary to the nervous system.

11 Organ Systems-endocrine system

It helps to regulate the physiology by secretion of hormones. These are also chemical messenger in the body.

There are different types of hormones controlling specific physiological purposes.

8. Reproductive system

This is the organ system that is responsible for the continuation of species.

11 Organ Systems-reproductive system

It helps in the formation of offspring to keep up further life. This system is quite interesting in that it is just one part and incomplete without the support from another opposite sex organism.

In males, it comprises organs like the testis, penis, prostate glands. In females, it consists of the vagina, uterus, uterine tubes, ovaries, and also mammary glands (breast).

9. Lymphatic system

11 Organ Systems-lymphatic system

This system provides a natural defense to the body. It kills bacteria, viruses, and other parasites residing in the body.

It comprises fluid lymph, lymph nodes, lymph organs (like the spleen, tonsils, thymus,) white blood cells, and antibodies (humeral substances).

The lymphatic system is arranged parallel to the blood circulation and widely distributed in important points of the body.

You can find it in the intestine, kidney, liver, brain, etc. where it traps the pathogens and prevents their further spread by destroying them.

10. Urinary system

This system is meant to remove the wastes and toxins from the body.

11 Organ Systems-urinary system

Any substance in the body is first converted to a water-soluble form by the liver.

This is transported by the blood to the kidneys of the urinary system. There the blood flows through the glomerulus of the nephron and gets filtered to lose those wastes.

The load on the kidney is reduced as other organs like the skin, lungs, and saliva also participate in the excretion of waste from the body.

11. Integumentary system

This is a covering system that covers the whole body surface.

11 Organ Systems-integumentarysystem

The organs under this system are skin, hair, nails, etc. It also prevents dehydration and heat loss. It keeps the body safe from damage, wears, and also infections. 

Though we can divide the body into various organs and organ systems, still if one system is affected, other systems slowly decline and cease to function. So they are interconnected and not single in function.

2 thoughts on “11 Organ Systems | Their Important Functions in the Human Body”

  1. Hi,
    This summer I made a great discovery. For more than one year I suffered of urinary urgencies with severe burning. I sort foods with little result. Sugar was the worst. I accused bread, milk, sweet fruits, salt, pickles, and so on. I considered normal at my 75 age. I had an inguinal hernia surgery and I accused that for my urinary tract irritation and urine produced burnings, especially the muscle responsible to prevent urine from leaving the bladder. I used dippers. I also consider to have sun-bathing this summer for vitamin D.
    I live in Washington state so here is not warm enough to stay in sun. Years ago, I bought a land in Nevada near the city Winnemucca, where the temperature is 96 F and I can stay in sun without to experience cyclic vomiting syndrome.
    For more than one year I used to eat sausages and bologna turkey. I noticed some itching infection on my chest and legs. During my travel to Nevada 700 miles, I eat just those foods. Once on my land I discovered on my chest another spot of infection with white heads. The conclusion was obvious, the foods I eat are responsible. I did not eat that kind of meat. After 4 weeks of staying in sun my chest become clean and no more itching on my chest and legs. Now I am back in Washington and I can eat bread, milk, gem, donuts and no more that urinary urgencies and no more dippers.
    I also use warm clothes to prevent and cure infections. I feel great.
    Please let people to know my discovery.
    if someone is interested write on my email [email protected]
    David Muresan

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