Unit 2 Body Systems Vocabulary Definitions

HUMAN BODY

SYSTEMS

VOCABULARY

CELL

the smallest functional and structural unit of all living things

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TISSUE

a group of similar cells working together to
perform a similar function

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ORGAN

different tissues working together to
perform a similar function

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ORGAN SYSTEM

different organs working together to
perform a similar function

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ORGANISM

a living thing

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DIGESTIVE
SYSTEM

system whose organs break down food so that it can be used by the body

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RESPIRATORY
SYSTEM

system with a collection of organs whose primary
function is to take in
oxygen and expel carbon
dioxide

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CIRCULATORY
(CARDIOVASCULAR)
SYSTEM


system whose organs
transport blood throughout
the body

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EXCRETORY SYSTEM

system whose primary function is to remove wastes from the body and regulate bodily fluids

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​CO2

MUSCULAR SYSTEM

system whose primary function is movement and flexibility

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IMMUNE
SYSTEM

organ system whose
cells and tissues
recognize and attack foreign substances in the body

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NERVOUS
SYSTEM

system whose primary
function is to send and
receive electrical
messages throughout
the body

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