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 Heart2h 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

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

What would happen if a muscle completely ran out of ATP during a muscle contraction.

The myosin head would not move into the cocked position.

After the power stroke, the myosin would remain bound to the actin.

The myosin would bind to the actin, but the power stroke would not occur.

The sarcoplasmic reticulum would be unable to release calcium.

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Verified step by step guidance

Understand the role of ATP in muscle contraction: ATP is crucial for muscle contraction as it provides the energy needed for the myosin heads to detach from the actin filaments after a power stroke.

Recognize the process of the power stroke: During muscle contraction, the myosin head binds to actin, performs a power stroke, and then requires ATP to detach and reset for another cycle.

Consider the consequence of ATP depletion: If a muscle runs out of ATP, the myosin heads cannot detach from the actin filaments after the power stroke, leading to a state known as rigor mortis.

Analyze the impact on calcium release: ATP is also necessary for the active transport of calcium ions back into the sarcoplasmic reticulum, which is essential for muscle relaxation.

Conclude the scenario: Without ATP, the myosin heads remain bound to actin, preventing further muscle contraction cycles, and calcium ions cannot be effectively sequestered, leading to sustained contraction.