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The H-zone disappears during full contraction as actin filaments slide over myosin. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.
The quadriceps femoris is the primary muscle responsible for knee extension.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Disorders of Muscular and Skeletal System
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