Class 11 Biology — Chapter 17: LOCOMOTION AND MOVEMENT
Chapter 17: LOCOMOTION AND MOVEMENT is a chapter in Class 11 Biology (NCERT), part of the CBSE NCERT curriculum followed by over 25 million students across India. This chapter covers 6 topics including Types of Movement, Classification of Muscles, Structure of a Skeletal Muscle. BrainWeave provides free AI-powered explanations — by voice or text, in Hindi or English — with no signup required.
What you'll learn
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▸Types of Movementlocomotionamoeboidciliarymuscularmacrophages
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▸Classification of MusclesCore conceptskeletal musclevisceral musclecardiac musclestriatedinvoluntary
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▸Structure of a Skeletal MuscleCore conceptfasciclemuscle fibersarcolemmasarcoplasmic reticulummyofibril
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▸The SarcomereCore conceptsarcomereA-bandI-bandZ-linemyofilaments
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▸Structure of Contractile ProteinsCore conceptactinmyosintroponintropomyosinmeromyosin
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▸Sliding Filament Theory of Muscle ContractionCore conceptsliding filament theoryneuromuscular junctioncross bridgecalcium ionsATP hydrolysis
Chapter Summary
Distinguish between the general concept of movement and the specific action of locomotion, and understand the three primary types of cellular movements in the human body: amoeboid, ciliary, and muscular, including examples of where they occur.
Differentiate between the three types of muscles—skeletal, visceral (smooth), and cardiac—based on their location, appearance (striated/non-striated), and mode of control (voluntary/involuntary).
Understand the hierarchical organization of a skeletal muscle, from the entire muscle wrapped in fascia to muscle bundles (fascicles), muscle fibers (cells), and the key cellular components like the sarcolemma, sarcoplasm, and sarcoplasmic reticulum.
Identify the sarcomere as the functional unit of muscle contraction and describe its detailed structure, including the arrangement of thick (myosin) and thin (actin) filaments that form the distinct A-bands, I-bands, H-zone, Z-line, and M-line.
Describe the molecular structure of the contractile proteins. This includes the thin filament, composed of F-actin, tropomyosin, and troponin, and the thick filament, made of meromyosin monomers with their globular heads (HMM) and tails (LMM).
Explain the step-by-step mechanism of muscle contraction as described by the sliding filament theory. This process includes neural signal transmission at the neuromuscular junction, release of calcium ions, binding of myosin to actin to form a cross-bridge, the power stroke, and the role of ATP in detaching the cross-bridge.
Practice Questions from this Chapter
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- Explain how muscles move bones. Get Solution →
- Describe the fastest animal movement. Get Solution →
- Illustrate different types of human joints. Get Solution →
- What are voluntary movements that result in a change of place or location called? Get Solution →
- Which of the following is a main type of movement exhibited by cells of the human body? Get Solution →
- Which tissue is of mesodermal origin and makes up 40-50% of an adult human's body weight? Get Solution →
- What are skeletal muscles also known as due to their striped appearance under a microscope? Get Solution →
- The plasma membrane lining a muscle fiber is called the: Get Solution →
Did you know?
- 💡 The human body has over 600 muscles controlling every move.
- 💡 Muscles only pull, they never push anything.
- 💡 The strongest muscle in your body by weight is the jaw muscle.
- 💡 A hummingbird can beat its wings up to 80 times per second.
- 💡 A snail moves by gliding on a single muscular foot.
Frequently Asked Questions
How many topics are covered in this chapter?
This chapter covers 6 key topics: Types of Movement, Classification of Muscles, Structure of a Skeletal Muscle, The Sarcomere, Structure of Contractile Proteins, and more. The BrainWeave AI tutor explains each one with examples.
Is Chapter 17: LOCOMOTION AND MOVEMENT important for board exams?
Class 11 is a foundation year. Mastering this chapter now will help you build strong fundamentals for the higher classes.
Can I get NCERT solutions for this chapter in Hindi?
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