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 muscles would have motor units with the smallest number of muscle cells?

Gluteus maximus muscle

Quadriceps femoris muscle

Gastrocnemius muscle of the calf

Extraocular muscles of the eye

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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. The size of a motor unit varies depending on the function of the muscle.

Recognize that muscles requiring fine, precise movements (like the extraocular muscles of the eye) have smaller motor units with fewer muscle cells per motor neuron. This allows for greater control and precision.

Compare the listed muscles: The gluteus maximus, quadriceps femoris, and gastrocnemius muscles are large muscles responsible for gross movements like walking, running, and jumping. These muscles have larger motor units because they do not require fine control.

Identify the extraocular muscles of the eye: These muscles control eye movement and require extremely precise control for tasks like tracking objects and focusing. Therefore, they have the smallest motor units with fewer muscle cells per motor neuron.

Conclude that the extraocular muscles of the eye are the correct answer because their function necessitates the smallest motor units for fine, precise movements.