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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

Sliding Filament Theory and the Sacromere

Anatomy & Physiology

9. Muscle Tissue

Sliding Filament Theory and the Sacromere

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Multiple Choice

In the context of the sliding filament theory, what is a sarcomere and what role does the Z-line play?

A sarcomere is the basic contractile unit of muscle fiber, and the Z-line marks the boundary between adjacent sarcomeres.

A sarcomere is a type of muscle protein, and the Z-line is where actin and myosin overlap.

A sarcomere is a type of muscle cell, and the Z-line is the point where muscle contraction begins.

A sarcomere is a segment of the myosin filament, and the Z-line is the center of the sarcomere.

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Verified step by step guidance

Understand that a sarcomere is the basic contractile unit of a muscle fiber, which is crucial for muscle contraction.

Recognize that the sarcomere is composed of overlapping protein filaments, primarily actin and myosin, which slide past each other to produce contraction.

Identify the Z-line (or Z-disc) as the structure that defines the boundaries of a sarcomere. It is where actin filaments are anchored.

Note that during muscle contraction, the Z-lines move closer together as the sarcomere shortens, which is a key aspect of the sliding filament theory.

Clarify that the Z-line does not mark the center of the sarcomere, nor is it the point where muscle contraction begins, but rather it serves as the boundary between adjacent sarcomeres.