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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

The T tubules of a muscle fiber are extensions of the ______ and contain extracellular fluid.

sarcoplasmic reticulum

myofibril

sarcoplasm

sarcolemma

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Verified step by step guidance

Understand the structure of a muscle fiber: A muscle fiber is composed of several key components, including the sarcolemma (plasma membrane), sarcoplasm (cytoplasm), sarcoplasmic reticulum (specialized endoplasmic reticulum), and myofibrils (contractile units).

Learn the role of T tubules: T tubules, or transverse tubules, are invaginations of the sarcolemma that penetrate into the interior of the muscle fiber. They play a critical role in transmitting action potentials deep into the muscle fiber to ensure uniform contraction.

Recognize the relationship between T tubules and extracellular fluid: Since T tubules are extensions of the sarcolemma, they are continuous with the extracellular space and contain extracellular fluid.

Differentiate the options provided: The sarcoplasmic reticulum is an intracellular structure that stores calcium ions, the myofibrils are contractile units within the muscle fiber, and the sarcoplasm is the cytoplasm of the muscle cell. None of these are directly related to the extracellular fluid or the sarcolemma.

Conclude that the correct answer is 'sarcolemma': Based on the anatomical and physiological characteristics of T tubules, they are extensions of the sarcolemma and contain extracellular fluid.