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Body Systems

Across
Circulates blood around the body
Produces sex hormones
Form the outer body's covering
Most complex organ
Opposes the sympathetic nervous system
Carries messages between the CNS and part of the body that signals internal and external changes
Body's defense against infections
Where kidneys filter blood
Removes carbon dioxide from the body
Provides chemical communications using hormones
Cells group together to form these
Down
Maintain body temperature
Supports the body
Delivers oxygen to tissues
Processes food
Defends against pathogens
Basic building blocks
Removes waste that cells produce
Activates body responses
Tissues grouped together to form these