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Biology & Geology (STEM)

Chapter 2 - Hormonal Coordination in Living Organisms

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Chapter 3 - Reproduction in Living Organisms

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Chapter 4 - Immunity in Living Organisms

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Chapter 5 - Molecular Biology - DNA Structure and Function

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Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

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Quiz

Lesson 2: Movement in Plants and Muscle Contraction Mechanics in Humans — Lesson quiz

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1.
Which sarcomere component maintains a constant length during both full contraction and relaxation?
The I-band
The A-band
The entire sarcomere
The H-zone
2.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Sliding Filament Theory of Muscle Contraction (Huxley)?
Both A-band and myosin filaments shrink by 50% in length
Cross-bridges pull actin filaments outward away from the M-line
Z-lines move away from each other as the muscle contracts
During sarcomere contraction, actin filaments slide over myosin filaments; the I-band and H-zone shorten, while the A-band length remains strictly constant
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