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

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

Which of the following steps of the crossbridge cycle occurs immediately before the power stroke?

Attachment of the myosin head to actin

Binding of ATP to the myosin head

Release of ADP and phosphate from the myosin head

Detachment of the myosin head from actin

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Verified step by step guidance

Understand the crossbridge cycle: The crossbridge cycle is a series of molecular events that occur during muscle contraction, involving the interaction between actin and myosin filaments.

Identify the sequence of events: The cycle includes several key steps: attachment of the myosin head to actin, the power stroke, release of ADP and phosphate, detachment of the myosin head, and binding of ATP.

Focus on the step before the power stroke: The power stroke is the action where the myosin head pivots, pulling the actin filament. Before this occurs, the myosin head must be attached to the actin filament.

Recognize the attachment step: The attachment of the myosin head to actin is crucial as it sets the stage for the power stroke. This is facilitated by the hydrolysis of ATP, which energizes the myosin head.

Review the options: Among the given options, the attachment of the myosin head to actin is the step that occurs immediately before the power stroke, enabling the subsequent movement of the actin filament.