Systems of human organs

Systems of human organs can be called the most complex and orderly among the entire animal kingdom. Each cell is necessary to perform a certain function. Similar structural formations are combined into complex systems that ensure a normal human existence.

According to the performed functions, the nervous, respiratory, digestive, immune, sexual, urinary, musculoskeletal, circulatory systems are secreted. Their work is interconnected, when one link is switched off, the functioning of the other component is disrupted.

Systems of human organs need constant monitoring. This function is performed by the nervous system. It is divided into central and peripheral. The first by means of nerve fibers connects all organs, so their work is controlled. When a particular lesion is injured, a specific signal is sent to the brain. It sends impulses to other organ systems, after which their activity decreases or intensifies, which is manifested in increased release of hormones. Also the brain carries out the higher nervous activity - thinking, memory. It is possible due to the presence of a specific formation - the bark.

The system of human respiratory organs is represented by light and air-conducting ways, which include the larynx, bronchi, trachea. She carries oxygen to the tissues by entering it into the blood. In the structure of the lungs there are alveoli, which are able to selectively pass the necessary element and take back the products of its processing.

The organs of the human immune system: thymus (thymus gland), lymph nodes, spleen They are involved in the production of specific cells that protect the human body from extraneous viral, infectious, protozoal, fungal diseases that come from outside. After the ingress of such agents, immune cells immediately bind to them, resulting in specific reactions that will manifest themselves in a number of characteristic symptoms: redness, fever, pain, swelling, impaired functions corresponding to organ damage.

Systems of human organs should constantly update their cellular composition. Therefore, it is necessary to supply nutrients: fats, carbohydrates, proteins. The last elements are the basic building material that is necessary for all cells. This function is performed by the digestive system, represented by the esophagus, stomach, intestine, which is divided into thin and thick. Also in it enter the liver, pancreas. They produce the enzymes necessary for the splitting of incoming food components. The system also performs excretory function. In addition, pancreatic hormones are necessary to maintain the physiological level of blood glucose.

Systems of human organs can not perform their function if they accumulate harmful products that are formed as a result of their activities. Therefore, the isolation of all unnecessary substances is an important function. For this, there is a excretory system, which is represented by the kidneys, the bladder. Also, it can include skin, lungs.

The sexual system has distinctive characteristics, which makes it possible to divide by sex into female and male. It is characterized by the presence of specific cells that perform reproductive functions. In men it is spermatozoa, in women - in eggs.

The musculoskeletal system is designed to move the human body in the surrounding space, as well as for the operation of all internal organs.