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

What is the name given to the regularly spaced infoldings of the sarcolemma in muscle fibers?

Myofibrils

Transverse (T) tubules

Motor end plates

Sarcoplasmic reticulum

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Verified step by step guidance

Understand the structure of a muscle fiber: Muscle fibers are specialized cells that contain various components, including the sarcolemma (cell membrane), myofibrils (contractile units), sarcoplasmic reticulum (calcium storage), and transverse (T) tubules (infoldings of the sarcolemma).

Recognize the function of the sarcolemma: The sarcolemma is the plasma membrane of a muscle fiber, and it plays a critical role in transmitting electrical signals during muscle contraction.

Learn about transverse (T) tubules: T tubules are regularly spaced infoldings of the sarcolemma that penetrate into the interior of the muscle fiber. They help propagate action potentials deep into the muscle cell to ensure uniform contraction.

Differentiate T tubules from other structures: Myofibrils are the contractile units of the muscle, the sarcoplasmic reticulum stores calcium ions, and the motor end plate is the region of the sarcolemma involved in neuromuscular junctions. None of these are infoldings of the sarcolemma like T tubules.

Conclude that the correct answer is transverse (T) tubules, as they are the specific structures described in the problem.