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Human body

The human body consists of cells, tissues, organs, and vital systems. Cells are the basic structural unit in the human body, and each cell from its cells has the ability to carry out the processes of metabolism , growth, and response to stimuli, and the tissue represents the level The second organizational system in the human body, and it consists of a group of identical cells that perform a specific function, and the human body contains four types of tissues, namely, muscle tissue, nervous tissue, connective tissue, and epithelial tissue, and the formation of different tissues that perform one function of the organ , while the group of members that work together to perform a specific function constitutes what is known as a biological system or biological system .

Human organs

The organs of the human body consist of two or more types of different tissues that perform a specific function, and the intestine is an example of an organ consisting of the four types of tissues, as it contains epithelial tissues made up of cells that secrete hormones and digestive enzymes, and other cells that absorb nutrients, and the intestine also contains Connective tissue, smooth muscle tissue, and nerve tissue made up of neurons that regulate smooth muscle contraction to allow food to pass through the intestine. Although the body is made up of different systems, it is not uncommon for there to be an organ that belongs to more than one vital system, such as the mouth, which is a common organ of the respiratory and digestive systems.

The number of organs in the human body

Until recently, it was believed that the number of organs in the human body was 78, but the number recently increased to 79, after the discovery of a new organ called the mesentery in the human digestive system . The mesraqis was previously classified as a group of separate structures in the digestive tract. However, the new discovery by researcher Calvin Covey, professor of surgery at the University of Limerick in Ireland, reclassified the mesoscope as an independent organ like the rest of the body.

The organs that make up the human body systems

The following is a presentation of the organs of the human body according to the biological system to which they belong:

Endocrine system: consists of the endocrine system of a group of glands that secrete hormones that help maintain the internal balance of the body: the pituitary gland, pineal gland, thyroid and parathyroid, pancreas, adrenal gland, the testes in males and ovaries in females.

Respiratory system: The respiratory system consists of a group of organs that work to transport air to places of gas exchange, and these organs are: the mouth, nose, pharynx, larynx, windpipe, bronchi, lungs and diaphragm.

Cardiovascular system: The cardiovascular system consists of the heart, blood, and blood vessels, and its function is to provide cells with oxygen, food and other necessary materials, and to rid them of waste and carbon dioxide .

Lymphatic system: the lymphatic system works to protect the body from pathogens, and the lymph moves between tissues and blood, and it consists of: lymph, lymph nodes, and lymph vessels.

The muscular system: the muscular system provides support for the body and aids in movement, and it is made up of cardiac muscles, smooth muscles, and skeletal muscles.

Nervous system: the nervous system works to collect, transmit and process information, and it consists of the brain, spinal cord, nerves, and sense organs, which are the nose, skin, eyes, tongue, and ears.

The reproductive system: The reproductive system consists of the sex cells and sex hormones, and the female reproductive system consists of the mammary glands, fallopian tubes, the uterus, ovaries, and the vagina, and the male reproductive system consists of the testicles, the vas deferens, the seminal vesicles, the prostate , and the penis.

The skeletal system: The skeletal system works to protect the soft tissues in the human body, produces blood cells , stores minerals, and enables the body to move. It is made up of bones, cartilage, joints, tendons, and ligaments.

The urinary system: The urinary system works to rid the body of waste products, water and excess salts and consists of two kidneys, two ureters, the urinary bladder and the urethra.

Digestive system: The digestive system consists of a group of organs and structures whose function is to convert food into an absorbable form, namely: the mouth that contains the tongue, teeth, pharynx, esophagus, stomach, and the small intestine that consists of the duodenum, the jejunum, the ileum, and the large intestine and consists of : cecum, colon rookie, the browser colon, descending colon and sigmoid colon, and rectum, (and Almsrac , a member who was discovered recently) as the digestive system contains glands secrete sap digestive: the salivary glands, the glands are infectious in the lining of the stomach, pancreas , liver, The gallbladder, and the bile ducts.

Immune system: The immune system consists of the tonsils, adenoids, thymus gland, and spleen .

The fascial system: also called the endovascular system, and it is a device that protects the body from infection with bacteria, and also protects it from fluid loss, and it has a role in regulating its temperature, as for the organs that make up it are: skin, hair, in addition to nails.

The vital organs of the human body

We mentioned previously that the human body contains 79 organs, and each member of the body has a specific function that it performs, which makes it a member of special importance in the human body. Despite this, a person can live even if he loses some of his organs, except for vital organs that cannot be Live without it, which is:

The brain: The brain is the center of control for all other body organs, so it receives signals from them and sends commands to them to regulate the work of the body as a whole, and it is also responsible for human thoughts and feelings, and it has special centers for storing memory and through it we can perceive what is going on around us.

Heart: The importance of the heart is that it is the organ responsible for pumping blood to all different parts of the body.

Kidneys: The kidneys perform an important function for the human body, as they remove excess fluid from blood and urea - a harmful substance that results from the destruction of certain types of food - in the form of urine.

Liver: The liver performs many important functions for the human body, including the secretion of bile, which is from the digestive juices, the production of blood clotting proteins, the detoxification of some harmful chemicals, the breakdown of medicines, and the filtering of blood.