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 Heart2h 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

The __________ are inward invaginations of the sarcolemma that run deep into the cell and ensure that every myofibril in the muscle fiber contracts at virtually the same time.

T tubules

Z discs

A bands

thin filaments

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Verified step by step guidance

Understand the structure of a muscle fiber: A muscle fiber is composed of myofibrils, which are long, filamentous organelles that have a banded appearance and are aligned to give distinct bands.

Identify the role of the sarcolemma: The sarcolemma is the plasma membrane of a muscle cell, which plays a crucial role in conducting electrical signals.

Learn about T tubules: T tubules, or transverse tubules, are extensions of the sarcolemma that penetrate into the center of skeletal and cardiac muscle cells.

Recognize the function of T tubules: They help transmit the action potential deep into the muscle cell, ensuring that the electrical signal reaches all parts of the muscle fiber simultaneously.

Conclude that T tubules are responsible for ensuring that every myofibril in the muscle fiber contracts at virtually the same time, as they allow the action potential to reach deep into the muscle cell.