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 of the following correctly lists the structures in order as light passes through the eyeball?

Aqueous humor → Cornea → Lens → Retina → Vitreous humor

Retina → Vitreous humor → Lens → Cornea → Aqueous humor

Lens → Cornea → Vitreous humor → Retina → Aqueous humor

Cornea → Aqueous humor → Lens → Vitreous humor → Retina

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Verified step by step guidance

Step 1: Begin by understanding the anatomy of the eye and the path light takes as it enters and travels through the structures of the eyeball. Light must pass through several transparent structures before reaching the retina, where it is detected and processed.

Step 2: Identify the first structure light encounters. The cornea is the outermost transparent layer of the eye and is responsible for refracting (bending) light to help focus it. Therefore, light first passes through the cornea.

Step 3: After the cornea, light enters the aqueous humor, a clear fluid located in the anterior chamber of the eye. The aqueous humor helps maintain intraocular pressure and provides nutrients to the cornea and lens.

Step 4: Next, light passes through the lens, a flexible, transparent structure that further focuses the light onto the retina. The lens adjusts its shape to focus on objects at varying distances.

Step 5: After the lens, light travels through the vitreous humor, a gel-like substance that fills the main cavity of the eyeball and helps maintain its shape. Finally, light reaches the retina, the innermost layer of the eye, where photoreceptor cells (rods and cones) detect the light and convert it into neural signals for the brain to interpret.