System of organs, irreplaceable for the organism: the structure of man

From the point of view of anatomy, a person is a complex system of organs. Irreplaceable for the body, each of them plays an important role. At the same time, all systems interact with each other, forming a single whole.

Systems of organs in the human body

Like the bodies of animals, the human body consists of elementary structures - cells. They, in turn, combine into tissues. The next level of organization is the body. Heart, liver, stomach ... Each of them includes several types of tissues. To perform complex and diverse functions, there are systems of organs of the animal body. Each of them is specialized. But some are combined to perform common functions. For example, only the coordinated work of the respiratory and circulatory systems ensures the gas exchange.

System of organs, irreplaceable for the organism

What is the most important organ system? And is there the same, irreplaceable? Musculoskeletal movement of the body and its individual parts, respiratory and circulatory - gas exchange, excretory and digestive - metabolism. Thanks to the reproductive system , a person reproduces. And the regulation of functions is carried out by the nervous and endocrine systems. Each of them is important in its own way.

Musculoskeletal system

The bones forming the skeleton are combined in different ways. For example, the ulnar and brachial joints are movably connected. Such a structure is called a joint. But between the individual vertebrae are located cartilaginous layers. This is a semi-mobile connection. And when you look at the skull it seems that it consists of one bone. In fact, this is not at all the case. This is an example of a fixed connection of bones. The exception is only the lower jaw. The musculoskeletal system is also composed of muscles and ligaments, by means of which they are attached to the bones.

Digestive system

The digestive system begins with the oral cavity, in which the teeth and tongue are located. And it continues with a pharynx, esophagus, stomach, a thin and large intestine, which opens outward with an anal opening. However, the splitting of substances in this system would be impossible without digestive glands: salivary, pancreatic and liver.

Circulatory and respiratory

Another system of organs, irreplaceable for the body, is the circulatory system. It consists of the heart and blood vessels. This liquid tissue transports gases, nutrients, participates in the formation of immunity and healing of wounds. The circulatory system is closely interlinked with the respiratory system, because the exchange of oxygen to carbon dioxide occurs precisely in the lungs.

Selection system

Urination occurs with the help of paired kidneys. Here, as a result of filtration and reabsorption, water is collected with toxic exchange products dissolved in it. They come out through the ureters opening by the canal.

Sexual

Man is a dioecious organism. But both the female and the male system have a common plan for the structure. It consists of the sex glands, ducts and cells. For a person is characterized by internal fertilization and direct development. Due to intrauterine development, a viable organism appears on the light.

Nervous and endocrine

These systems of organs "guide" the body. Nervous consists of the brain and spinal cord, as well as individual fibers that depart from them. It connects the whole body into a single whole, and also realizes its interrelation with the surrounding world with the help of the senses. As you can see, this is exactly the system of organs, irreplaceable for the organism. Is life possible without hormones? Of course not. The processes of growth, puberty, regulation of metabolism - the result of the endocrine system.

So, every system of organs, irreplaceable for the organism, fulfills its function and determines its normal vital activity. The complex coordinated structure of the human body, which has clear regulation mechanisms, is the pinnacle of the evolutionary development of the organic world.