"Muscles Only Pull, Never Push"
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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.
Show
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.