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 occur if a contracting muscle became totally depleted of ATP?

The muscle would exhibit isotonic contraction.

The muscle would exhibit isometric contraction.

The muscle would relax and lengthen because of an inability to sustain actin-myosin cross bridges.

The muscle would remain in a contracted state because of an inability to break actin-myosin cross bridges.

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Verified step by step guidance

Understand the role of ATP in muscle contraction: ATP is crucial for muscle contraction and relaxation. It provides the energy needed for the myosin heads to detach from the actin filaments after a power stroke, allowing the cycle of muscle contraction to continue.

Recognize the process of cross-bridge cycling: During muscle contraction, myosin heads bind to actin filaments forming cross-bridges. ATP is required to detach these myosin heads from actin, allowing them to reset and bind again for another contraction cycle.

Consider the consequence of ATP depletion: If ATP is depleted, myosin heads cannot detach from actin filaments. This inability to release the cross-bridges results in a continuous contracted state, known as rigor.

Differentiate between isotonic and isometric contractions: Isotonic contractions involve muscle shortening with movement, while isometric contractions involve tension without muscle shortening. Both require ATP for cross-bridge cycling.

Conclude the effect of ATP depletion: Without ATP, the muscle cannot relax and remains in a contracted state due to the inability to break the actin-myosin cross-bridges, leading to a condition similar to rigor mortis.