Table of contents

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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

9. Muscle Tissue

Sliding Filament Theory and the Sacromere

Anatomy & Physiology

9. Muscle Tissue

Sliding Filament Theory and the Sacromere

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Multiple Choice

What generates the force that shortens the sarcomeres to bring about muscle contraction?

The breakdown of ATP into ADP and phosphate

The influx of sodium ions into the muscle fiber

The binding of myosin heads to actin filaments

The release of calcium ions from the sarcoplasmic reticulum

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Verified step by step guidance

Understand the structure of a sarcomere: Sarcomeres are the basic functional units of muscle fibers, composed of actin (thin filaments) and myosin (thick filaments).

Learn about the role of myosin and actin: Myosin heads bind to actin filaments, forming cross-bridges that are essential for muscle contraction.

Explore the process of cross-bridge cycling: When myosin heads bind to actin, they undergo a conformational change that pulls the actin filaments, shortening the sarcomere.

Recognize the importance of calcium ions: Calcium ions released from the sarcoplasmic reticulum bind to troponin, causing a shift in tropomyosin and exposing binding sites on actin for myosin.

Understand the role of ATP: ATP is hydrolyzed to ADP and phosphate, providing the energy required for myosin heads to detach from actin and reattach for another cycle of contraction.