11.2.docx - Bones and exoskeletons provide anchorage for...

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Bones and exoskeletons provide anchorage for muscles and act as levers. Tendonfs: Muscle to bonde; tendons= tender like chikenc EXOSKELETON: It is a hard skeleton on the outside of the body ENDOskeleton: skeleton inside of the body i.e humans Skeletons provide surface are for muscles to be attached and the bones have lever properties allowing them to induce movement Synovial joints allow certain movements but not others Synovial Joint type Possible movments Hinge joint; knee and elbow Flexion and extension Ball and socket joint; hip and shoulder Circumduction all mvoments Pivot joint; Rotation Depending on the type of synovial joint; the movements change.
Movement of the body requires muscles to work in antagonistic pairs. Muscles can contract (shorted) and relax (lengthen) only. Atagonstic pairs are used ino order to do to function efficiently. While on contracts the other relaxes and vice vera. Example of this is Bicep triceps muscles and the hamstring quadriceps; the one that is contracted is called the agonist. SKILL: Annotate AN ELBOW JOINT Muscles in insects
Skeletal muscle fibres are multinucleate and contain specialized endoplasmic reticulum.

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