Biology / Bio 3125 · Atom · ~20 seconds
"Muscles Only Pull, Never Push"
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State
Stating flatly that muscles never push overstates a real pattern — one muscle only pulls as it contracts, per Bio 3115, but bodies still achieve pushing motion.
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Extending an elbow to push a door is the triceps contracting and pulling, not the arm pushing directly.
Watch for
This entry states the popular framing — Bio 3127 gives the pairing mechanism it overlooks.