Locomotion and Movement
From a smile to a sprint, every move uses muscle and bone together. This chapter in NCERT Class 11 Biology, Chapter 17, explains muscle types, sliding filament contraction, joints, and the human skeleton with skull, vertebrae, ribs, girdles and limbs. It details actin, myosin, calcium and ATP in contraction, and lever action of joints. You will learn to name major bones, distinguish ball, hinge and pivot joints, and understand cramps, tetany, myasthenia, arthritis, osteoporosis and fractures.
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