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

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

The sliding filament theory explains how muscles contract. Which of the following best describes this process?

Tropomyosin blocks the binding sites on actin, preventing muscle contraction.

Actin and myosin filaments slide past each other, shortening the sarcomere.

ATP is used to detach myosin heads from actin filaments, lengthening the sarcomere.

Calcium ions are released from the sarcoplasmic reticulum, causing muscle relaxation.

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Verified step by step guidance

Begin by understanding the basic structure of a muscle fiber, which includes the sarcomere as the functional unit of contraction.

Recognize that the sliding filament theory involves the interaction between actin and myosin filaments within the sarcomere.

Identify the role of calcium ions, which are released from the sarcoplasmic reticulum and bind to troponin, causing tropomyosin to move and expose binding sites on actin.

Understand that ATP is crucial for muscle contraction, as it provides the energy for myosin heads to attach to actin, perform a power stroke, and then detach, allowing the filaments to slide past each other.

Conclude that the sliding of actin and myosin filaments past each other results in the shortening of the sarcomere, leading to muscle contraction.