Locomotion and Movement
You pick up a bag, and your arm bends at the elbow. Under the skin, thousands of tiny threads slide past each other, and a bone turns at a joint. In this chapter you see how living things move, and why a sprinter and a long-distance runner use different muscle fibres. You build a muscle from its smallest unit, the sarcomere, and watch it shorten step by step. Then you count the 206 bones of the skeleton and learn how its joints and its disorders work. Python counts fibres, measures bands, steps through the cross-bridge cycle and totals the bones.
Part of Biology · High School (11–12) (chapter 16)
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Movement and the Structure of Muscle
What the difference is between movement and locomotion, and how a cell or an animal moves with cilia, flagella or muscles. The three kinds of muscle, how a skeletal muscle is built from bundles, fibres and myofibrils, and what the sarcomere and its two proteins, actin and myosin, look like. It covers the unit of the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
How a Muscle Contracts
How a signal from a nerve reaches a muscle fibre, why calcium ions switch the contraction on, and how the myosin heads pull the actin filaments in the cross-bridge cycle. Why the bands of the sarcomere change while the filaments keep their length, how a muscle tires, and how red and white fibres differ. It covers the unit of the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.