HLSC 1200U Lecture 12: bones,joints, muscles and muscle contraction(online)
2 Nov 2016
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Document Summary
Flexing a joint reduces the angle of the joint, as in bending the elbow. Extending a joint increases the angle of the joint, as in straightening a bent elbow. Rotation a joint spins one bone relative to another, as in rotating the head at the neck joint. Circumduction a joint moves the distal end of a bone in a circle, while keeping proximal end relatively stable, ass in moving the arm in a circle at the shoulder end. Ball and socket joint abduction abduction a joint increases the angle of a joint to move a part away from the midline, as in moving the foot to the side and away from the body. Condyloid joint adduction adducting a joint decreases the angle of a joint to move a part toward the midline, as in moving the foot to the side and toward the body. Isotonic muscle shortens and produces movement (in most cases, movement at a joint)
