参考答案:
Muscles can only provide a force on contraction.
An antagonistic pair of muscles move bones in opposite directions.
When one muscle of the pair contracts, the other is (reflexively) extended.
When one muscle is extended, titin stores potential energy for (the subsequent) contraction.
The stored energy (in titin protein) lowers the energy needed for contraction.
The external intercostal muscles contract to raise the ribs and the internal intercostal muscles contract to lower the ribs.
They are attached at different angles onto the rib cage (to cause the movement).
The (antagonistic) muscles contract rhythmically to control breathing movements.
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