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Circulatory System
transports necessary substances to cells, and carries waste products away to be removed by other body systems
Respiratory System
moves oxygen into the body and removes carbon dioxide
Nervous System
receives and responds to information; controls the body
Skeletal System
provides shape and support to the body; protects internal organs
Muscular System
provides movement
Digestive System
breaks down food, absorbs nutrients from food, and removes waste
Excretory System
collects and removes waste from the body; filters blood
Main organ of the Digestive System
Stomach

Main organ of the Circulatory System
Heart

Main organ of the Respiratory System
Lungs

Main organ of the Nervous System
Brain

Main organ(s) of the Skeletal System
Bones

Main organ of the Excretory System
Kidneys

Main organ(s) of the Muscular System
Muscles (3 Types of Muscle Tissue)

Cell
the smallest, most basic unit of life
Tissues
groups of similar cells that group together to do the same job
4 Types of Tissue
Connective, Muscle, Nervous, Epithelial
Organ
a structure made up of two or more types of tissue that work together to do the same job
Organ System
a group of similar organs that work together to do the same job
Organism
living things; things that have all of the characteristics of life