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 of the following statements about the sarcoplasmic reticulum in muscle fibers is correct?

The sarcoplasmic reticulum is more extensive in skeletal muscle fibers than in smooth muscle fibers.

The sarcoplasmic reticulum is equally extensive in both skeletal and smooth muscle fibers.

Neither skeletal nor smooth muscle fibers contain a sarcoplasmic reticulum.

The sarcoplasmic reticulum is more extensive in smooth muscle fibers than in skeletal muscle fibers.

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Verified step by step guidance

Step 1: Understand the role of the sarcoplasmic reticulum (SR) in muscle fibers. The SR is an organelle responsible for storing and releasing calcium ions, which are essential for muscle contraction.

Step 2: Compare the structure and function of skeletal muscle fibers and smooth muscle fibers. Skeletal muscle fibers are highly organized and require rapid calcium release for quick contractions, while smooth muscle fibers contract more slowly and do not require as extensive a calcium storage system.

Step 3: Analyze the differences in the sarcoplasmic reticulum between skeletal and smooth muscle fibers. Skeletal muscle fibers have a more extensive SR to support their rapid and forceful contractions, whereas smooth muscle fibers have a less developed SR due to their slower contraction mechanism.

Step 4: Eliminate incorrect options based on the structural and functional differences. For example, the statement 'Neither skeletal nor smooth muscle fibers contain a sarcoplasmic reticulum' is incorrect because both types of muscle fibers do contain an SR, though its extent varies.

Step 5: Select the correct answer by identifying the statement that aligns with the anatomical and physiological characteristics of the sarcoplasmic reticulum in skeletal and smooth muscle fibers. The correct answer is: 'The sarcoplasmic reticulum is more extensive in skeletal muscle fibers than in smooth muscle fibers.'