What is the structure of people?

The human body consists of bones, muscles, tissues, organs, exercise, blood circulation, respiration, digestion, urine, reproduction, nerves, endocrine and other systems. Among them, the nervous system coordinates the functions of the whole human body and receives external information through sensory organs.

Human tissue

The skeleton consists of about 200 bones, forming a strong and flexible skeleton. The contraction of muscles ensures that the joints between different bones can move freely: muscles attach to the bones at both ends of the joints and cause joint movement when contracting. Bones, joints and muscles make up the movement system.

Internal organs are mainly located in the trunk of human body. The trunk is divided into three parts from top to bottom: chest, abdominal cavity and pelvic cavity. The chest, which consists of ribs and sternum, contains the heart and lungs. The diaphragm separates the abdominal cavity from the chest cavity. Most digestive organs, kidneys and spleen are located in the abdominal cavity. There are bladder, end of digestive tract and female reproductive organs in pelvic cavity.

The brain and spinal cord constitute the central nervous system. The brain is located in the skull. The skull has a relative protective effect on the brain, while the spinal cord is hidden in the bone tubes piled up in the vertebrae.