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Joints & Movement

Muscles bring about movement at a joint. They can only pull; they cannot push, so at least 2 muscles are needed to move a bone to and fro. A
pair of muscles that work in this way are described as antagonistic.

An extensor is a muscle that…

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6. ATP molecules bind to the myosin head which causes the head to detach.
7. ATPase on the myosin head hydrolyses the ATP, forming ADP and P.
8. The hydrolysis causes a change in shape of the myosin head ­ it returns to its upright position ­ enabling the cycle…


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