Human Body Systems

Circulatory System

The group of organs consisting of the heart and blood vessels that circulate blood through the body

Digestive System

A group of organs in the body that work together to transform the energy and materials in food into a form the body can use, including the stomach, intestines, and the liver

Endocrine System

A group of organs called glands and the hormones they produce that help regulate conditions inside the body

Excretory/Urinary System

A group of organs, including the kidneys and bladder, that eliminates waste from the body

Muscular System

The muscles of the body that, together with the skeletal system, function to produce movement

Skeletal System

The framework of bones that supports the body, protects internal organs, and anchors all of the body's movement

Nervous System

The brain and network of nerves that control the body's movement, thoughts, and automatic responses to the environment

Respiratory System

A system that interacts with the environment and with other body systems to bring oxygen to the body and remove carbon dioxide

Lymphatic/Immune System

The organ system that consists of a large network of lymphatic vessels, nodes, tissues, bone marrow, etc. that maintains fluid levels in the body tissues and produces immune responses

Reproductive System

The tissues, glands, and organs involved in sexual reproduction

Integumentary System

The set of organs that forms the external covering of the body and includes skin, hairs, nails, and glands

Homeostasis

The ability of the body to maintain stable internal conditions