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

15. The Special Senses

Introduction to Special Senses

Anatomy & Physiology

15. The Special Senses

Introduction to Special Senses

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Multiple Choice

Why is control over leg muscles less precise than control over the muscles of the eye?

Leg muscles have larger motor units compared to the small motor units in eye muscles.

Eye muscles are innervated by more motor neurons than leg muscles.

Leg muscles are composed of more fast-twitch fibers than eye muscles.

Leg muscles have a higher density of muscle spindles than eye muscles.

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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 affects the precision of muscle control.

Compare motor unit sizes: Leg muscles have larger motor units, meaning each motor neuron controls more muscle fibers, leading to less precise control. Eye muscles have smaller motor units, allowing for more precise movements.

Consider the number of motor neurons: Eye muscles are innervated by more motor neurons, which contributes to their ability to perform precise movements.

Analyze muscle fiber types: Fast-twitch fibers are designed for quick, powerful movements but are less precise. Leg muscles have more fast-twitch fibers compared to eye muscles, which affects precision.

Evaluate muscle spindle density: Muscle spindles are sensory receptors that help regulate muscle contraction. A higher density of muscle spindles in leg muscles can affect control, but the primary factor in precision is motor unit size.