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

3. Energy & Cell Processes

ATP

Anatomy & Physiology

3. Energy & Cell Processes

ATP

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Multiple Choice

What is the role of ATP in cross-bridge cycling during muscle contraction?

ATP binds to actin to initiate the power stroke.

ATP provides the energy needed to detach the myosin head from the actin filament.

ATP is responsible for the release of calcium ions from the sarcoplasmic reticulum.

ATP directly causes the myosin head to bind to actin.

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Verified step by step guidance

Understand the structure of a muscle fiber, focusing on the sarcomere, which is the functional unit of muscle contraction. The sarcomere contains actin (thin filament) and myosin (thick filament) proteins.

Learn about the cross-bridge cycle, which is the process that leads to muscle contraction. This cycle involves the interaction between actin and myosin filaments.

Recognize the role of ATP in the cross-bridge cycle. ATP binds to the myosin head, causing it to detach from the actin filament. This is a crucial step in the cycle, allowing the myosin head to reset and prepare for another power stroke.

Understand that after ATP binds to the myosin head, it is hydrolyzed to ADP and inorganic phosphate (Pi). This hydrolysis provides the energy needed for the myosin head to return to its 'cocked' position, ready to bind to actin again.

Note that ATP is not responsible for the initial binding of myosin to actin or the release of calcium ions from the sarcoplasmic reticulum. Its primary role is to provide energy for detachment and re-cocking of the myosin head, facilitating repeated cycles of muscle contraction.