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

How do muscle fibers exhibit varying degrees of contraction in response to different levels of stimulation?

By recruiting different numbers of motor units

By changing the length of the muscle fibers

By increasing the number of muscle fibers in the muscle

By altering the number of mitochondria in each fiber

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Verified step by step guidance

Understand the concept of motor units: A motor unit consists of a single motor neuron and all the muscle fibers it innervates. Muscle contraction strength depends on the number of motor units activated.

Learn about recruitment: Recruitment is the process by which the nervous system increases the number of active motor units to generate greater force. This allows muscles to exhibit varying degrees of contraction based on the level of stimulation.

Recognize the role of muscle fiber length: Muscle fibers have an optimal length at which they generate maximum force. However, this does not directly explain varying degrees of contraction in response to stimulation.

Understand the role of mitochondria: Mitochondria are involved in energy production but do not directly influence the degree of contraction in response to stimulation.

Conclude that varying degrees of contraction are achieved by recruiting different numbers of motor units, as this is the mechanism that adjusts the force generated by the muscle.