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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

A motor unit consists of:

Several motor neurons connected to a single muscle fiber

A single motor neuron and all the muscle fibers it innervates

A muscle fiber and all the neurons that supply it

All the muscles in a given muscle group

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Verified step by step guidance

Understand the definition of a motor unit: A motor unit is the functional unit of the neuromuscular system, consisting of a single motor neuron and all the muscle fibers it innervates.

Clarify the role of the motor neuron: A motor neuron is a nerve cell that transmits signals from the central nervous system to muscle fibers, causing them to contract.

Recognize the relationship between the motor neuron and muscle fibers: A single motor neuron can innervate multiple muscle fibers, but each muscle fiber is innervated by only one motor neuron.

Eliminate incorrect options: For example, 'several motor neurons connected to a single muscle fiber' is incorrect because a single muscle fiber is innervated by only one motor neuron. Similarly, 'a muscle fiber and all the neurons that supply it' is incorrect for the same reason.

Conclude with the correct answer: A motor unit is defined as a single motor neuron and all the muscle fibers it innervates, which matches the correct option provided in the problem.