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Skeleton and Movement

Maharashtra Board · Class 11 · Biology

Quick revision notes for Skeleton and Movement — Maharashtra Board Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

41 questions20 flashcards5 concepts

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Key Topics to Revise

1

Types of Movements and Locomotion

  • Movement can be internal (peristalsis, blood circulation) or external (limb movement, locomotion)
  • Movement can be voluntary (controlled by striated muscles) or involuntary (controlled by smooth and cardiac muscles)
  • Four basic types of locomotory movements: Amoeboid (pseudopodia), Ciliary (cilia), Whorling (flagella), and Muscular (muscles with bones)
2

Structure and Working of Skeletal Muscles

  • Three types of skeletal muscles based on function: Agonists (prime movers like biceps), Synergists (assist prime movers like brachialis), Antagonists (opposite action like triceps)
  • Muscle attachment points: Origin (attached to stationary bone), Insertion (attached to movable bone), Belly (middle thick part)
  • Muscles work in antagonistic pairs - one contracts while the other relaxes
3

Molecular Basis of Muscle Contraction

  • Contractile unit of muscle is sarcomere containing actin (thin) and myosin (thick) filaments
  • Myosin filament: Made of heavy meromyosin (HMM) and light meromyosin (LMM), has cross bridges with myosin heads containing ATPase activity
  • Actin filament: Contains F-actin (backbone), tropomyosin (covers binding sites), and troponin (calcium-binding protein)
4

Mechanism of Muscle Contraction and Relaxation

  • Contraction process: Nerve impulse → Action potential in T-tubules → Calcium release → Troponin-tropomyosin complex change → Active sites exposed → Myosin-actin binding → Power stroke → Contraction
  • Relaxation process: Stimulus stops → Calcium ions return → Troponin-tropomyosin complex restored → Active sites covered → Filaments return to original position
  • Both contraction and relaxation are active processes requiring ATP

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Full Notes

Key Concepts

Movement includes any change in positionFour basic typesProposed by HMuscles work in pairs producing oppositeThe adult human skeleton has 206

Frequently Asked Questions

What are the important topics in Skeleton and Movement for Maharashtra Board Class 11 Biology?
Skeleton and Movement covers several key topics that are frequently asked in Maharashtra Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Skeleton and Movement — Maharashtra Board Class 11 Biology?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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