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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

Which of the following correctly arranges the steps of the muscle contraction cycle in order from first to last?

Cross-bridge formation → Power stroke → Detachment of myosin from actin → Reactivation of myosin head

Detachment of myosin from actin → Cross-bridge formation → Power stroke → Reactivation of myosin head

Reactivation of myosin head → Detachment of myosin from actin → Power stroke → Cross-bridge formation

Power stroke → Cross-bridge formation → Detachment of myosin from actin → Reactivation of myosin head

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Verified step by step guidance

Step 1: Understand the muscle contraction cycle, which involves the interaction between actin and myosin filaments within the sarcomere. This process is driven by ATP and calcium ions.

Step 2: Recall the sequence of events in the muscle contraction cycle: (1) Cross-bridge formation occurs when the myosin head binds to actin, facilitated by calcium ions exposing binding sites on actin. (2) The power stroke follows, where the myosin head pivots, pulling the actin filament toward the center of the sarcomere. (3) Detachment of myosin from actin happens when ATP binds to the myosin head, causing it to release from actin. (4) Reactivation of the myosin head occurs as ATP is hydrolyzed into ADP and inorganic phosphate, re-cocking the myosin head for another cycle.

Step 3: Analyze the options provided in the question and compare them to the correct sequence of events in the muscle contraction cycle.

Step 4: Eliminate incorrect options by identifying sequences that do not follow the physiological order of the muscle contraction cycle.

Step 5: Select the option that correctly arranges the steps in the order: Cross-bridge formation → Power stroke → Detachment of myosin from actin → Reactivation of myosin head.