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

14. The Autonomic Nervous System

Introduction to the Autonomic Nervous System

Anatomy & Physiology

14. The Autonomic Nervous System

Introduction to the Autonomic Nervous System

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Multiple Choice

Which of the following is an effect of the sympathetic division on the eye?

Relaxation of the ciliary muscle for near vision

Constriction of the pupil

Increased tear production

Dilation of the pupil

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Verified step by step guidance

Understand the role of the sympathetic division of the autonomic nervous system. It is responsible for the 'fight or flight' response, which prepares the body for action by increasing alertness and energy availability.

Review the anatomy of the eye and its autonomic control. The pupil is controlled by two muscles: the sphincter pupillae (constricts the pupil) and the dilator pupillae (dilates the pupil). The sympathetic division stimulates the dilator pupillae muscle.

Analyze the options provided. Relaxation of the ciliary muscle for near vision is incorrect because the sympathetic division typically facilitates far vision by relaxing the ciliary muscle. Constriction of the pupil is incorrect because this is a parasympathetic response. Increased tear production is also incorrect because tear production is primarily controlled by the parasympathetic division.

Focus on the correct answer: Dilation of the pupil. This occurs because the sympathetic division activates the dilator pupillae muscle, allowing more light to enter the eye, which is beneficial in low-light or high-alert situations.

Summarize the physiological mechanism: The sympathetic division causes dilation of the pupil by stimulating the dilator pupillae muscle, which is part of the body's response to stress or danger, enhancing vision in challenging conditions.