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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

During the phase of excitation-contraction coupling of skeletal muscle, what occurs immediately after the action potential spreads down the T tubule?

Acetylcholine is released from the axon terminus.

The cross bridge forms.

The power stroke takes place.

The sarcoplasmic reticulum releases calcium.

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Verified step by step guidance

Understand the process of excitation-contraction coupling in skeletal muscle, which is the sequence of events that converts an action potential in a muscle fiber into a contraction.

Recognize that the action potential travels along the sarcolemma and down the T tubules, which are invaginations of the sarcolemma that penetrate into the cell's interior.

Identify that the T tubules are closely associated with the sarcoplasmic reticulum, a specialized endoplasmic reticulum that stores calcium ions.

After the action potential reaches the T tubules, it triggers the opening of voltage-sensitive channels in the sarcoplasmic reticulum.

The opening of these channels results in the release of calcium ions from the sarcoplasmic reticulum into the cytosol, which is the immediate next step in the process.