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 muscle type depends solely on the sarcoplasmic reticulum as its calcium source for contraction?

Cardiac muscle

Smooth muscle

Skeletal muscle

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Verified step by step guidance

Step 1: Understand the role of calcium in muscle contraction. Calcium ions are essential for initiating the contraction process in all muscle types by interacting with regulatory proteins such as troponin and tropomyosin.

Step 2: Learn about the sarcoplasmic reticulum (SR). The SR is an organelle found in muscle cells that stores and releases calcium ions during muscle contraction.

Step 3: Compare the calcium sources for different muscle types. Cardiac and smooth muscles rely on both extracellular calcium (from outside the cell) and calcium stored in the sarcoplasmic reticulum. Skeletal muscle, however, depends solely on the calcium stored in the sarcoplasmic reticulum for contraction.

Step 4: Recall the structural differences between muscle types. Skeletal muscle has a highly developed sarcoplasmic reticulum, which ensures sufficient calcium storage for contraction without needing extracellular calcium.

Step 5: Conclude that skeletal muscle is the correct answer because it exclusively uses calcium from the sarcoplasmic reticulum for its contraction process.