Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

In the context of the sliding filament theory, what function do the proteins actin and myosin perform?

They generate electrical impulses for muscle contraction.

They store calcium ions in the sarcoplasmic reticulum.

They transport oxygen within muscle cells.

They facilitate the contraction of muscle fibers.

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Verified step by step guidance

Understand the sliding filament theory: This theory explains how muscles contract by the sliding of actin and myosin filaments past each other, which shortens the muscle fiber.

Identify the role of actin: Actin is a thin filament that provides a track for myosin heads to attach and pull, facilitating muscle contraction.

Identify the role of myosin: Myosin is a thick filament with heads that bind to actin, forming cross-bridges and pulling the actin filaments inward during contraction.

Recognize the interaction between actin and myosin: The myosin heads use ATP to change shape and pull the actin filaments, causing the muscle to contract.

Conclude the function of actin and myosin: Together, actin and myosin facilitate the contraction of muscle fibers by sliding past each other, which is the core mechanism of the sliding filament theory.