First of all, the motion system
It consists of bones, joints and muscles, accounting for about 60% of the adult's weight. The bones of the whole body are connected by joints to form bones, which play a role in supporting weight, protecting internal organs and maintaining the basic shape of the human body.
Skeletal muscles are attached to bones and contract and relax under the control of the nervous system. When contracting, the joint is used as the fulcrum to pull the bone to change its position and produce movement. Bones and joints are passive parts of the exercise system, while skeletal muscle is the active part of the exercise system.
It consists of bones, joints and muscles, accounting for about 60% of the adult's weight. The bones and joints of the whole body are connected to form bones, which can support weight, protect internal organs and maintain the basic shape of the human body.
Skeletal muscles are attached to bones and contract and relax under the control of the nervous system. When contracting, the joint is used as the fulcrum to pull the bone to change its position and produce movement. ?
Bones and joints are passive parts of the exercise system, while skeletal muscle is the active part of the exercise system.
Second, the nervous system
The nervous system plays a leading role in the human body. All kinds of information of internal and external environment are received by receptors, transmitted to the centers of brain and spinal cord through peripheral nerves for integration, and then controlled and regulated by peripheral nerves to maintain the relative balance between the body and internal and external environment.
The nervous system consists of brain, spinal cord, cranial nerve, spinal nerve, autonomic nerve and various ganglia. It can coordinate the activities of various organs and systems in the body, making it a complete whole and interacting with the external environment.
The nervous system is the main system in the human body. All kinds of information in the internal and external environment are received by the receiver and integrated into all levels of the brain and spinal cord through peripheral nerves.
Then it is controlled and regulated by peripheral nerves to maintain the relative balance between the body and the internal and external environment.
The nervous system consists of brain, spinal cord, cranial nerve, spinal nerve, autonomic nerve and various ganglia. It can coordinate the activities of internal organs and systems, make them a whole, and interact with the external environment.
Third, the endocrine system
Endocrine glands are some glands in the human body that have no outlet ducts. Its secretions are called hormones. It plays a regulatory role in the growth, development, metabolism and reproduction of the whole body.
The main endocrine glands in human body are hypothalamus, pituitary gland, thyroid gland, adrenal gland, islet, thymus gland and gonad.
Endocrine glands are some glands in the human body that have no export ducts. Its secretions are called hormones. It regulates the growth, development, metabolism and reproduction of the whole body.
The main endocrine glands are hypothalamus, pituitary gland, thyroid gland, adrenal gland, islet, thymus gland and gonad.
Fourth, the circulatory system.
The blood circulation system is a system consisting of body fluids (including intracellular fluid, plasma, lymph and tissue fluid) and the pipes through which they circulate. Because animals form the heart, the blood circulation system is divided into two parts: the heart and blood vessels, which is called the cardiovascular system.
The circulatory system is a transport system in the organism, which transports nutrients absorbed by the digestive tract and oxygen inhaled through gills or lungs to various tissues and organs, and inputs the metabolites of various tissues and organs into the blood through the same way and excretes them through the lungs and kidneys.
The blood circulation system is a system of body fluids (including intracellular fluid, plasma, lymph and tissue fluid) and their circulation pipes. ?
The blood circulation system is divided into heart and blood vessels, which is called cardiovascular system. The circulatory system is the transportation system in the organism. ?
It transports nutrients absorbed by digestive tract and oxygen absorbed by gills or lungs to various tissues and organs, and inputs the metabolites of various tissues and organs into the blood through the same way and discharges them through the lungs and kidneys.
Verb (abbreviation for verb) respiratory system
The respiratory system includes respiratory tract (nasal cavity, pharynx, larynx, trachea, bronchus) and lung.
In the process of metabolism, animals constantly consume oxygen and produce carbon dioxide. The process of gas exchange between human body and external environment is called breathing. There are two places for gas exchange, one is the gas exchange between the outside world and respiratory organs (such as lungs and gills), which is called lung breathing or gill breathing (or external breathing); The other is the gas exchange between blood and tissue fluid and between body tissues and cells (called internal respiration).
The respiratory system includes respiratory tract (nasal cavity, pharynx, larynx, trachea, bronchus) and lung.
Animals need to consume oxygen and produce carbon dioxide in the process of metabolism. The process of gas exchange between organisms and the environment is called breathing. ?
There are two places for gas exchange. One is the gas exchange between the outside world and respiratory organs (such as lung and parotid gland), which is called lung breathing or parotid gland breathing (or external breathing). ?
The other is the gas exchange between blood and tissue fluid, as well as between body tissues and cells (called internal respiration).
Six, digestive system
Organs related to digestion and feeding in human body include: mouth, pharynx, esophagus, stomach, small intestine, large intestine, anus, salivary gland, stomach gland, intestinal gland, pancreas, liver, etc. Therefore, it is called digestive organ. These digestive organs work together to digest food and absorb nutrients. The sum of all digestive organs is called digestive system.
The organs related to digestion and feeding in human body are oral cavity, pharynx, esophagus, stomach, small intestine, large intestine, anus, salivary gland, gastric gland, intestinal gland, pancreas and liver, so it is called digestive organ. ?
These digestive organs work together to digest food and absorb nutrients. The sum of all digestive organs is called digestive system.
Seven, urinary system
The urinary system consists of kidney, ureter, bladder and urethra. Its main function is excretion. Excretion refers to the physiological process in which various substances that are not utilized or harmful to the body are transported to the outside world during the metabolism of the body.
Part of the discharged substances are metabolites of nutrients; The other part is the product of the destruction of aging cells. In addition, excreta also includes some unnecessary substances ingested with food, such as excess water and inorganic salts.
The urinary system consists of kidney, ureter, bladder and urethra. Its main function is excretion. ?
Excretion refers to the physiological process that various substances produced in the process of metabolism are not used by the body or transported to the outside by harmful substances. ?
Some of the discharged substances are metabolites of nutrients, and some are products formed when aging cells are destroyed. In addition, excreta also contains some unnecessary substances that are ingested with food, such as excess water and inorganic salts.
Eight, reproductive system
Reproductive system is the general name of organ components closely related to reproduction in organisms. The function of reproductive system is to produce germ cells, reproduce new individuals, secrete sex hormones and maintain secondary sexual characteristics. There are two types of human reproductive system: male and female. According to the position of genitalia, it is divided into two parts: internal genitalia and external genitalia.
Reproductive system is the general name of organ components closely related to reproduction in organisms.
The function of reproductive system is to produce germ cells, reproduce new individuals, secrete sex hormones and maintain secondary sexual characteristics.
There are two types of human reproductive system: male and female. According to the position of genitalia, it can be divided into two parts: internal genitalia and external genitalia.
Baidu Encyclopedia-Eight Systems of Human Body