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Body System Pathways
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Grade 7
7.27 Body System Pathways
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Which model best explains how body cells can build new proteins after a meal and a workout?
A
Respiratory system turns oxygen directly into protein inside the lungs.
B
Digestive system breaks food into smaller molecules, blood delivers those molecules to cells, and cells use them to build tissues.
C
Urinary system stores protein until muscles pull it from the bladder.
D
Skeletal system absorbs whole food pieces and attaches them to muscles.
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