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

What is the primary function of T-tubules in muscle cells?

To synthesize ATP for muscle energy

To provide structural support to the muscle cell

To conduct electrical impulses into the muscle fiber

To store calcium ions for muscle contraction

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Verified step by step guidance

Understand the structure of a muscle cell: Muscle cells, or muscle fibers, have specialized structures that facilitate contraction. One such structure is the T-tubule (transverse tubule).

Identify the role of T-tubules: T-tubules are invaginations of the sarcolemma (muscle cell membrane) that penetrate into the cell's interior.

Explore the function of T-tubules: The primary function of T-tubules is to conduct electrical impulses (action potentials) from the surface of the muscle fiber deep into the cell.

Connect T-tubules to muscle contraction: By conducting electrical impulses, T-tubules ensure that the signal for contraction reaches all parts of the muscle fiber simultaneously, which is crucial for coordinated contraction.

Clarify misconceptions: T-tubules do not synthesize ATP or store calcium ions. Instead, the sarcoplasmic reticulum, another organelle in muscle cells, stores calcium ions, which are released in response to the electrical signals conducted by T-tubules.