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

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which structure within a skeletal muscle fiber stores calcium ions necessary for muscle contraction?

Myofibril

Sarcolemma

Sarcoplasmic reticulum

T-tubule

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Verified step by step guidance

Understand the role of calcium ions in muscle contraction: Calcium ions are essential for initiating the interaction between actin and myosin filaments, which is the basis of muscle contraction.

Identify the structure responsible for storing calcium ions: Within a skeletal muscle fiber, the sarcoplasmic reticulum is a specialized organelle that stores and releases calcium ions when needed.

Differentiate between the given options: The myofibril is the contractile unit of the muscle, the sarcolemma is the plasma membrane of the muscle fiber, and the T-tubule is involved in transmitting the action potential into the muscle fiber. None of these structures store calcium ions.

Focus on the sarcoplasmic reticulum: This organelle surrounds the myofibrils and has a high concentration of calcium ions, which are released into the cytoplasm during muscle contraction.

Conclude that the sarcoplasmic reticulum is the correct answer: It is the structure within a skeletal muscle fiber that stores calcium ions necessary for muscle contraction.