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

Which organelle in skeletal muscle fibers stores calcium ions necessary for muscle contraction?

Nucleus

Sarcoplasmic reticulum

Mitochondrion

Golgi apparatus

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Verified step by step guidance

Step 1: Understand the role of calcium ions in muscle contraction. Calcium ions are essential for initiating the interaction between actin and myosin filaments, which leads to muscle contraction.

Step 2: Identify the organelle responsible for storing calcium ions in skeletal muscle fibers. The sarcoplasmic reticulum is a specialized form of the endoplasmic reticulum found in muscle cells, and its primary function is to store and release calcium ions.

Step 3: Compare the functions of the other organelles listed in the problem. The nucleus contains genetic material and regulates cellular activities, the mitochondrion produces ATP for energy, and the Golgi apparatus processes and packages proteins. None of these are directly involved in calcium storage for muscle contraction.

Step 4: Recognize that the sarcoplasmic reticulum is uniquely adapted for calcium storage and release. It has specialized channels and pumps, such as the calcium ATPase pump, to regulate calcium ion concentration within the muscle fiber.

Step 5: Conclude that the correct answer is the sarcoplasmic reticulum, as it is the organelle responsible for storing calcium ions necessary for muscle contraction.