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 skeletal muscle complex known as the triad consists of which of the following structures?

Two terminal cisternae and one transverse (T) tubule

Two Z lines and one M line

One sarcomere and two myofibrils

Three myosin filaments

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Verified step by step guidance

Understand the term 'triad' in the context of skeletal muscle anatomy. The triad is a structural feature found in skeletal muscle fibers that facilitates excitation-contraction coupling.

Recall the components of the triad. It consists of two terminal cisternae (enlarged areas of the sarcoplasmic reticulum) and one transverse (T) tubule, which is an invagination of the sarcolemma.

Recognize the function of the triad. The T tubule allows the transmission of action potentials deep into the muscle fiber, while the terminal cisternae store calcium ions necessary for muscle contraction.

Eliminate incorrect options by matching the structural components described in the question to the known anatomy of the triad. For example, Z lines and M lines are part of the sarcomere, not the triad.

Confirm that the correct answer is 'Two terminal cisternae and one transverse (T) tubule,' as this matches the definition and function of the triad in skeletal muscle fibers.