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

1. Introduction to Anatomy & Physiology

What is Anatomy & Physiology?

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

What is Anatomy & Physiology?

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Multiple Choice

Most skeletal muscles contain which of the following types of muscle fibers?

Only slow fibers

A mixture of slow and fast fibers

Only fast fibers

Only cardiac muscle fibers

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Verified step by step guidance

Understand the types of muscle fibers: Skeletal muscles are composed of different types of fibers, primarily slow-twitch (Type I) and fast-twitch (Type II). Slow-twitch fibers are designed for endurance and sustained activities, while fast-twitch fibers are suited for quick, powerful movements.

Recognize the functional diversity of skeletal muscles: Most skeletal muscles are required to perform a variety of tasks, ranging from maintaining posture (which relies on slow-twitch fibers) to generating quick bursts of power (which rely on fast-twitch fibers).

Acknowledge the mixture of fibers: To meet the diverse functional demands, skeletal muscles typically contain a combination of both slow-twitch and fast-twitch fibers. The proportion of these fibers can vary depending on the muscle's role and the individual's genetics and training.

Eliminate incorrect options: 'Only slow fibers' and 'Only fast fibers' are incorrect because skeletal muscles are not exclusively composed of one type of fiber. 'Only cardiac muscle fibers' is also incorrect because cardiac muscle fibers are found in the heart, not in skeletal muscles.

Conclude with the correct answer: The correct answer is 'A mixture of slow and fast fibers,' as this composition allows skeletal muscles to perform a wide range of functions effectively.