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

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which of the following structures marks the boundary between adjacent sarcomeres in skeletal muscle fibers?

M line

Z disc (Z line)

A band

H zone

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the functional unit of a skeletal muscle fiber, composed of repeating units of actin and myosin filaments. It is bounded by Z discs (also called Z lines) on either end.

Learn the role of the Z disc: The Z disc is a dense protein structure that anchors the thin filaments (actin) and marks the boundary between adjacent sarcomeres. It plays a critical role in maintaining the alignment of sarcomeres during muscle contraction.

Differentiate the other options: The M line is located in the center of the sarcomere and anchors the thick filaments (myosin). The A band represents the region of the sarcomere containing the entire length of the thick filaments, and the H zone is the central part of the A band where only thick filaments are present.

Recognize the correct answer: The Z disc (Z line) is the structure that marks the boundary between adjacent sarcomeres, distinguishing it from the M line, A band, and H zone.

Apply this knowledge to similar questions: When asked about sarcomere boundaries or anchoring points, remember that the Z disc is the defining structure for sarcomere boundaries, while other regions like the M line, A band, and H zone have different roles within the sarcomere.