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

What is the sliding filament model of muscle contraction?

It describes how actin and myosin filaments slide past each other to shorten the sarcomere.

It outlines the role of neurotransmitters in muscle contraction.

It details the process of ATP synthesis in muscle cells.

It explains how calcium ions are stored in the sarcoplasmic reticulum.

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Verified step by step guidance

Understand the basic structure of a muscle fiber, focusing on the sarcomere, which is the functional unit of muscle contraction. The sarcomere is composed of actin (thin) and myosin (thick) filaments.

Learn about the role of myosin heads in muscle contraction. Myosin heads bind to specific sites on the actin filaments, forming cross-bridges.

Explore the process of cross-bridge cycling, where myosin heads pull actin filaments towards the center of the sarcomere. This action is powered by the hydrolysis of ATP, which provides the necessary energy.

Examine the role of calcium ions in muscle contraction. Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, causing a conformational change that exposes binding sites on actin for myosin attachment.

Review the overall effect of the sliding filament model, which is the shortening of the sarcomere and thus the contraction of the muscle fiber. This process is repeated in a coordinated manner across many sarcomeres, leading to muscle contraction.