List of Body Systems

Its main function is to act as a barrier to protect the body from the outside world.

It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature.

The main function of the muscular system is movement.

Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body.

Related to the function of movement is the muscular system's second function: the maintenance of posture and body position.

The adult human skeletal system consists of 206 bones, as well as a network of tendons, ligaments and cartilage that connects them.

The skeletal system performs vital functions — support, movement, protection, blood cell production, calcium storage and endocrine regulation — that enable us to survive.

The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body.

Together, these organs are responsible for the control of the body and communication among its parts.

The human circulatory system functions to transport blood and oxygen from the lungs to the various tissues of the body.

The heart pumps the blood throughout the body.

The lymphatic system is an extension of the human circulatory system that includes cell-mediated and antibody-mediated immune systems.

The primary function of the lymphatic system is to transport lymph, a fluid containing infection-fighting white blood cells, throughout the body.

The lymphatic system primarily consists of lymphatic vessels, which are similar to the circulatory system's veins and capillaries.

The function of the human respiratory system is to transport air into the lungs and to facilitate the diffusion of Oxygen into the blood stream.

It also receives waste Carbon Dioxide from the blood and exhales it.

he endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the body that regulate the activity of cells or organs.

These hormones regulate the body's growth, metabolism (the physical and chemical processes of the body), and sexual development and function.

Their function is to remove liquid waste from the blood in the form of urine; keep a stable balance of salts and other substances in the blood; and produce erythropoietin, a hormone that aids the formation of red blood cells.

The kidneys remove urea from the blood through tiny filtering units called nephrons.

These external structures include the penis, the scrotum, and the testicles.

The organs of the male reproductive system are specialized for the following functions: to produce, maintain and transport sperm (the male reproductive cells) and protective fluid (semen) to discharge sperm within the female reproductive tract.

The female reproductive system provides several functions.

The ovaries produce the female egg cells, called the ova or oocytes.

The oocytes are then transported to the fallopian tube where fertilization by a sperm may occur.

The function of the digestive system is digestion and absorption.

Digestion is the breakdown of food into small molecules, which are then absorbed into the body.

The digestive system is divided into two major parts: The digestive tract (alimentary canal) is a continuous tube with two openings: the mouth and the anus.

The immune system is made up of a network of cells, tissues, and organs that work together to protect the body.

One of the important cells involved are white blood cells, also called leukocytes, which come in two basic types that combine to seek out and destroy disease-causing organisms or substances.