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

Structure of a Skeletal Muscle

Anatomy & Physiology

9. Muscle Tissue

Structure of a Skeletal Muscle

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Multiple Choice

Which of the following describes a transverse tubule (T-tubule)?

A protein that binds calcium ions during muscle contraction.

A structure that conducts action potentials from the sarcolemma to the sarcoplasmic reticulum.

A type of connective tissue that surrounds muscle fibers.

A component of the sarcomere responsible for muscle contraction.

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Verified step by step guidance

Understand the role of a transverse tubule (T-tubule) in muscle physiology. T-tubules are invaginations of the sarcolemma, the muscle cell membrane, that penetrate into the cell's interior.

Recognize that T-tubules are crucial for conducting action potentials. An action potential is an electrical signal that travels along the sarcolemma and needs to be transmitted deep into the muscle fiber to trigger contraction.

Identify the connection between T-tubules and the sarcoplasmic reticulum. The sarcoplasmic reticulum stores calcium ions, which are essential for muscle contraction. T-tubules help transmit the action potential to the sarcoplasmic reticulum.

Eliminate incorrect options by understanding their roles: Calcium-binding proteins, connective tissues, and sarcomere components have different functions in muscle physiology.

Conclude that the correct description of a T-tubule is its role in conducting action potentials from the sarcolemma to the sarcoplasmic reticulum, facilitating muscle contraction.