Class 11 Biology - CBSE
Locomotion and Movement
The chapter Locomotion and Movement in CBSE Class 11 Biology explores how living organisms execute various forms of movement and locomotion. It details the types of movement exhibited by human cells and organs, such as amoeboid, ciliary, and muscular movement. You will deeply study the structure of skeletal muscle, the sliding filament theory of muscle contraction, and the organization of the human skeletal system, including the axial and appendicular skeleton. Finally, the chapter covers major joints and common muscular or skeletal disorders like myasthenia gravis, tetany, and osteoporosis, making it a high-scoring topic for your board exams.
Start Learning FreeKey Concepts
Types of Movement
Cells of the human body exhibit amoeboid, ciliary, and muscular movements depending on their location and specialized functions.
Structure of Skeletal Muscle
Skeletal muscles are made of muscle bundles containing muscle fibers, which in turn consist of alternating dark (A) and light (I) bands formed by actin and myosin filaments.
Sliding Filament Theory
Mechanism of muscle contraction where thin actin filaments slide past thick myosin filaments, shortening the sarcomere through calcium ion release and ATP hydrolysis.
Human Skeletal System
Comprises 206 bones divided into the axial skeleton (80 bones forming the central axis) and the appendicular skeleton (126 bones forming the limbs and girdles).
Joints
Points of contact between bones or cartilage that allow varying degrees of movement, categorized into fibrous, cartilaginous, and synovial joints.
Disorders of Muscular and Skeletal System
Pathological conditions affecting movement, including myasthenia gravis, tetany, muscular dystrophy, arthritis, osteoporosis, and gout.
Important Formulas
Board Exam Info
In CBSE Class 11 Biology, this chapter typically carries around 4 to 6 marks. Common question types include diagram-based questions on the sarcomere or human skull, differentiation between red and white muscle fibers, and direct questions explaining the sliding filament theory or various skeletal disorders.
Frequently Asked Questions
What is the difference between movement and locomotion?
Movement is a change in position of any part of the body, whereas locomotion is voluntary movement resulting in a change of place or location.
How does the sliding filament theory explain muscle contraction?
It states that contraction occurs when myosin heads bind to actin, forming cross-bridges that pull the actin filaments inward, causing the sarcomere to shorten.
What is the role of calcium ions in muscle contraction?
Calcium ions bind to troponin on the actin filament, masking the active binding sites for myosin to expose them and allow cross-bridge formation.
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