Understand the 11 organ systems of the body


An organ system is a group of organs that work together to perform a complex function. There are eleven organ systems in the human body. All of this is necessary for the survival of a person or a species.

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The cardiovascular system

When we think and talk about the circulatory system, we usually talk about the cardiovascular system, which includes:

  • Heart
  • Blood vessels (arteries and veins)
  • The same blood

The circulatory system supplies oxygenated nutrients to all corners of the body and carries away metabolic by-products. In order for blood to flow everywhere, the circulatory system maintains blood flow within a certain pressure range.

Too high blood pressure puts undue pressure on other organs and tissues. Low blood pressure means that the blood and the nutrients it contains will not get to the right place.

High blood pressure kills you slowly, while low blood pressure can kill you right away.

Lymphatic system

The heart and blood vessels are not the only organs that circulate fluid throughout the body, and blood is not the only circulating fluid.

The lymphatic system carries lymph (fluid) by:

The lymphatic system plays a key role in maintaining immunity, regulating blood pressure, digestion, and other functions .

The lymphatic system is the body's drainage system that carries excess fluid, protein, fat, bacteria, and other substances from cells and the spaces between cells, which must be filtered, excreted, and recycled.

The lymphatic system also helps create and circulate vital disease-fighting cells (part of the immune system discussed below), including lymphocytes, monocytes, and antibodies.

Respiratory system

The respiratory system contains:

  • Lungs
  • Trachea (windpipe)
  • Airway of the respiratory tree

It is responsible for respiration , that is, the controlled movement of air in and out of the body (ventilation), as well as the movement of oxygen and carbon dioxide in and out of the bloodstream (respiration) .

One of the least understood functions of the respiratory system is to regulate the body's pH balance.

Carbon dioxide is converted to carbonic acid, which the respiratory system can regulate with the level of carbon dioxide. When a patient has a condition that affects the acidity of the body, the rate and depth of breathing can be a sign of a problem.

Integumentary system

Integumentary system – skin, including:

  • Sweat glands
  • Hair follicles
  • Many nerves

The integumentary system is unique because it is the only system with a single organ. The skin is both an organ and a complete organ system.

Endocrine system

The endocrine system includes all the glands that release hormones into the bloodstream . The endocrine system and the nervous system are generally considered the two most complex systems in the body.

The endocrine system mainly regulates metabolism and uses digestive products.

Gastrointestinal (digestive) system

The gastrointestinal (GI) system is colloquially known as the intestine. It includes all the organs that transport food from where it enters to where it leaves, including:

  • Esophagus
  • Stomach
  • Bowels

The gastrointestinal tract and the endocrine system interact closely.

The gastrointestinal system also contains a very important nerve called the vagus nerve. It is the main factor affecting the parasympathetic nervous system and is largely associated with slowing down metabolism, reducing heart rate and blood pressure, and stimulating the digestive mechanism.

urinary system

The urinary system consists of:

  • Kidney
  • Ureters
  • Bladder
  • Urethra

These organs work together to filter the blood and remove toxins and waste from body tissues. Eliminating excess fluid through the urinary system also helps regulate blood pressure.

Musculoskeletal system


  • Skeleton
  • All the muscles, tendons and ligaments attached to it.

The musculoskeletal system provides the foundation and engine for our movement, posture, and productivity.

There are three types of muscles in the body:

  • Striated (skeletal or arbitrary)
  • Mild (visceral or involuntary)
  • Cardiac (heart muscle)

In the musculoskeletal system, only skeletal muscle exists.

Nervous system

The nervous system includes:

  • Brain
  • Spinal cord
  • All the nerves associated with these two organs.

The nervous system is incredibly detailed and includes the only tissue that does not feed directly through contact with blood.

Reproductive system

The reproductive system is the only system that is divided into two parts. Half of us have:

  • Penis
  • Testicles

The other half has:

  • Vagina
  • Uterus
  • Ovaries

It is the only organ system that is not complete in any body and requires another person (or medical intervention) to fulfill its mission.

The immune system

The immune system ranks last because, while it performs a vital function for the survival of both humans and species, all of the organs that make up the immune system are borrowed from other organ systems.

The organs of the immune system function like sailors on a warship: each sailor has a primary responsibility and is trained to ensure the safety of the ship.

Primary organs of the immune system:

  • Lymph node
  • Bone marrow
  • Scam
  • Spleen
  • Adenoids
  • Anginas
  • Leather

Due to interactions between organs of various other systems, the immune system is one of the most complex.

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