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

Structure of the Eyeball

Anatomy & Physiology

15. The Special Senses

Structure of the Eyeball

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Multiple Choice

Which structure in the eye plays a role in accommodation by holding the lens in place?

Iris

Retina

Cornea

Ciliary body

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Verified step by step guidance

Understand the concept of accommodation: Accommodation is the process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies.

Identify the structures involved in accommodation: The key structures involved in accommodation are the lens, ciliary body, and zonular fibers.

Recognize the role of the ciliary body: The ciliary body is a ring of tissue that encircles the lens. It contains the ciliary muscle, which contracts and relaxes to change the shape of the lens.

Explain how the ciliary body functions: When the ciliary muscle contracts, it reduces tension on the zonular fibers, allowing the lens to become more rounded for focusing on near objects. When it relaxes, the lens flattens for distant vision.

Conclude that the ciliary body holds the lens in place and facilitates accommodation by altering the lens shape through its muscle contractions.