Human Biology worksheets
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What is the smallest unit of life in the human body?
organ
cell
body system
tissue
Which system provides structure and support for the body?
skeletal
muscular
digestive
excretory
Which system breaks down food?
excretory
circulatory
respiratory
digestive
Which gas do humans breathe in so our cells can make energy?
oxygen
carbon dioxide
nitrogen
water vapor
Which system works to transport oxygen and other nutrients throughout the body?
nervous
circulatory
excretory
muscular
Which system removes waste products from blood?
circulatory
digestive
excretory
respiratory
Which system protects the body from pathogens?
circulatory
immune
nervous
skeletal
Which system is the control center of the body?
immune
circulatory
nervous
muscular
Which system enables movement of the body?
skeletal
nervous
muscular
respiratory
All of the body systems work together to maintain stability and balance in the body. Another word for this is...
homeostasis
hypothesis
stimulus
holographic
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