Biology · Class 11 · Chapter 17
Locomotion and Movement
12 lessons 82 min 2 simulations
This chapter explains how the human body moves. It separates movement from locomotion, lists the three kinds of movement our cells show, and compares skeletal, visceral and cardiac muscle. It then opens up a skeletal muscle down to the sarcomere and its actin and myosin filaments, walks through the sliding filament theory step by step, and contrasts red and white fibres. The second half counts the 206 bones of the axial and appendicular skeleton, classifies joints, and ends with common muscle and bone disorders.
What the exam asks
NEET asks for exact counts (206 bones; 80 axial; 22 skull bones, 8 cranial and 14 facial; 26 vertebrae as 7-12-5-1-1; 12 pairs of ribs split 7 true, 3 false, 2 floating; 30 bones per limb; 8 carpals, 7 tarsals, 14 phalanges), for the order of events in muscle contraction, and for which bands shorten. Marks are lost by saying the A band shortens, by giving troponin (instead of tropomyosin) as the filament running along actin, by mixing up joint examples, and by confusing gout with arthritis or tetany with myasthenia gravis.
Lessons
12 lessons · 82 min
1Movement and locomotionNCERT §17 (opening)6 min2Types of movementNCERT §17.15 min3Types of muscleNCERT §17.26 min4Structure of skeletal muscleNCERT §17.26 min5Structure of contractile proteinsNCERT §17.2.16 min6Mechanism of muscle contractionNCERT §17.2.29 min 1 sim7Red and white fibresNCERT §17.2.25 min8Axial skeletonNCERT §17.36 min9Appendicular skeletonNCERT §17.39 min 1 sim10JointsNCERT §17.46 min11Disorders of muscular and skeletal systemNCERT §17.55 min12Chapter reviewMust-know facts, traps and formulas13 min