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

2. Cell Chemistry & Cell Components

Introduction to Eukaryotic Organelles

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Eukaryotic Organelles

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Multiple Choice

Most of the calcium in skeletal muscle cells is stored in the:

Golgi apparatus

nucleus

mitochondria

sarcoplasmic reticulum

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Verified step by step guidance

Step 1: Understand the role of calcium in skeletal muscle cells. Calcium ions are essential for muscle contraction, as they interact with proteins like troponin and tropomyosin to enable the sliding of actin and myosin filaments.

Step 2: Identify the organelle responsible for calcium storage in skeletal muscle cells. 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 during muscle contraction and relaxation.

Step 3: Compare the functions of the other organelles listed in the options. The Golgi apparatus is involved in protein modification and transport, the nucleus houses genetic material, and mitochondria are responsible for energy production. None of these organelles specialize in calcium storage.

Step 4: Recall the process of muscle contraction. When a muscle cell is stimulated, calcium is released from the sarcoplasmic reticulum into the cytoplasm, triggering the contraction mechanism. After contraction, calcium is actively pumped back into the sarcoplasmic reticulum for storage.

Step 5: Confirm the correct answer based on the physiological role of the sarcoplasmic reticulum in calcium storage and release, which is critical for muscle function.