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

Which statement correctly describes changes in a skeletal muscle cell during muscle contraction?

The sarcoplasmic reticulum releases potassium ions to initiate contraction.

The muscle cell membrane becomes impermeable to calcium ions.

ATP is not required for the detachment of myosin heads from actin filaments.

The sarcomeres shorten as actin and myosin filaments slide past each other.

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Verified step by step guidance

Understand the role of the sarcomere in muscle contraction: The sarcomere is the basic contractile unit of a muscle fiber, and its shortening is responsible for muscle contraction.

Identify the sliding filament theory: During muscle contraction, actin (thin filaments) and myosin (thick filaments) slide past each other, which leads to the shortening of the sarcomere.

Clarify the role of calcium ions: Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, causing a conformational change that allows myosin heads to bind to actin.

Explain the role of ATP: ATP is crucial for muscle contraction and relaxation. It is required for the detachment of myosin heads from actin filaments after a power stroke, allowing the cycle to continue.

Conclude with the correct statement: The correct description of changes in a skeletal muscle cell during contraction is that the sarcomeres shorten as actin and myosin filaments slide past each other.