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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 describes step three of a muscle contraction?

The myosin head binds to actin forming a cross-bridge.

The sarcomere shortens as the actin filaments slide over the myosin filaments.

Calcium ions are released from the sarcoplasmic reticulum.

ATP binds to the myosin head, causing it to detach from actin.

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Verified step by step guidance

Understand the sequence of events in muscle contraction, which involves several key steps: initiation, cross-bridge formation, power stroke, detachment, and reactivation.

Recognize that muscle contraction is initiated when calcium ions are released from the sarcoplasmic reticulum, which is an early step in the process.

Identify that the formation of a cross-bridge occurs when the myosin head binds to actin, which is a crucial step in the contraction cycle.

Acknowledge that the power stroke occurs as the sarcomere shortens, with actin filaments sliding over myosin filaments, following the cross-bridge formation.

Note that ATP binding to the myosin head causes it to detach from actin, allowing the cycle to repeat, which is a later step in the contraction process.