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

Deep inward extensions of the sarcolemma form a tunnel-like network inside the muscle cell known as:

Endomysium

Sarcoplasmic reticulum

Myofibrils

Transverse (T) tubules

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Verified step by step guidance

Understand the structure of a muscle cell: Muscle cells, also known as muscle fibers, have specialized structures that facilitate contraction and communication within the cell.

Learn about the sarcolemma: The sarcolemma is the plasma membrane of a muscle cell. It plays a critical role in conducting electrical signals necessary for muscle contraction.

Explore the function of T-tubules: Transverse (T) tubules are deep inward extensions of the sarcolemma that penetrate into the muscle cell. They form a tunnel-like network and are essential for transmitting action potentials deep into the cell to ensure uniform contraction.

Differentiate T-tubules from other structures: Endomysium is a connective tissue surrounding individual muscle fibers, sarcoplasmic reticulum is an organelle responsible for calcium storage, and myofibrils are the contractile units of the muscle cell. None of these structures are extensions of the sarcolemma.

Conclude that T-tubules are the correct answer: Based on their function and location, T-tubules are the structures described in the problem as deep inward extensions of the sarcolemma forming a tunnel-like network inside the muscle cell.