List of systems of the human body

List of Systems of the Human Body

The human body is a complex biological system involving cells, tissues, organs, and systems all working together to make up a human being. From the outside, the human body can be divided into several main structures. The body's shape is determined by the axial and appendicular skeleton and by distribution of muscle and fat. The circulatory system, endocrine system, immune system, integumentary system, lymphatic system, muscular system, nervous system, reproductive system, respiratory system, skeletal system, and urinary system are the eleven main systems of the human body.

Circulatory System

The circulatory system is a body-wide network of blood, blood vessels, and the heart, which is responsible for pumping the blood and carrying nutrients and oxygen throughout the body.

Endocrine System

The endocrine system consists of glands that control many of the body's functions by secreting hormones into the bloodstream. These hormones regulate a range of bodily functions from metabolism and growth to sexual development and the body's response to stress.

Immune System

The immune system is the body's defense against infectious organisms and other invaders. It is made up of a network of cells, tissues, and organs that work together to protect the body.

Integumentary System

The integumentary system is the external covering of the body, including the skin, hair, nails, and sweat and oil glands. It is the body's first line of defense against the environment.

Lymphatic System

The lymphatic system is a network of tissues and organs that help rid the body of toxins, waste and other unwanted materials. It includes the lymph nodes, spleen, thymus, and vessels that carry lymph throughout the body.

Muscular System

The muscular system is responsible for the movement of the human body. It consists of skeletal, smooth and cardiac muscles and it controls movement of the body, maintains posture, and circulates blood throughout the body.

Nervous System

The nervous system is the body's control system and communication network. It consists of the brain, spinal cord, and nerves, and it controls and coordinates all the body's functions.

Reproductive System

The reproductive system is a group of organs responsible for producing offspring. In males, this includes the penis, testes, and prostate gland. In females, it includes the ovaries, fallopian tubes, uterus, and vagina.

Respiratory System

The respiratory system is responsible for taking in oxygen and expelling carbon dioxide. The main organs of the respiratory system are the lungs, which carry out this exchange of gases with the blood.

Skeletal System

The skeletal system provides the body's structural framework. It consists of bones, cartilage, ligaments, and tendons.

Urinary System

The urinary system eliminates waste from the body, regulates blood volume and blood pressure, controls levels of electrolytes and metabolites, and regulates blood pH.