Unit 3: Human Body Vocabulary

Vocabulary flashcards covering key terms and definitions from the 7th Grade Life Science Unit on the Human Body.

Cell

The smallest living organism and the basic unit of life on earth.

Tissue

A group of cells that work together to perform a specific function.

Organ

A structure made up of different types of tissues that work together to perform a specific function.

Organ System

A group of organs that work together to perform a specific function or set of functions in the body.

Organism

A living individual that can carry out all the processes of life (reproduce, grow, respond to stimuli, & maintain homeostasis).

Digestive System

Responsible for breaking down food into nutrients that can be absorbed by the body.

Nervous System

Responsible for controlling the body's activities; includes the brain, spinal cord, and nerves.

Muscular System

Responsible for movement.

Excretory System

Responsible for removing waste products from the body; includes the kidneys, ureters, bladder, and urethra.

Circulatory System

Responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body.

Respiratory System

Responsible for the exchange of oxygen and carbon dioxide between the body and the environment.

Immune System

Responsible for defending the body against pathogens, including bacteria, viruses, and parasites.

Homeostasis

The maintenance of a constant internal state in a changing environment.

Lymphatic System

A network of vessels, nodes, and organs that helps defend the body against infections.

Endocrine System

Responsible for producing and regulating hormones, which are chemical messengers controlling bodily functions.

Reproductive System

Responsible for the production of offspring and ensuring the continuation of the species.

Skeletal System

Provides support, protection, and movement for the body; made up of bones, cartilage, ligaments, and tendons.

Integumentary System

Provides protection from the environment, regulates body temperature, and helps eliminate waste products.

Cell > Tissue > Organ > Organ System > Organism

Biological Levels of Organization