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

Which of the following defines a motor unit?

A single motor neuron and all the muscle fibers it innervates

A single muscle fiber and its associated blood vessels

A group of muscle fibers that contract together

A collection of motor neurons that control a single muscle

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Verified step by step guidance

Begin by understanding the concept of a motor unit in the context of muscle physiology. A motor unit is the fundamental unit of muscle contraction and control.

Recognize that a motor unit consists of a single motor neuron and all the muscle fibers it innervates. This means that when the motor neuron sends a signal, all the muscle fibers in that unit contract simultaneously.

Differentiate between the options provided: A single muscle fiber and its associated blood vessels do not constitute a motor unit, as blood vessels are not involved in the direct control of muscle contraction.

Consider the option of a group of muscle fibers that contract together. While muscle fibers do contract together, they do so because they are innervated by the same motor neuron, which defines a motor unit.

Finally, evaluate the option of a collection of motor neurons controlling a single muscle. This does not define a motor unit, as a motor unit is specifically one motor neuron and its associated muscle fibers, not multiple neurons.