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

The Lens and Focusing Light on the Retina

Anatomy & Physiology

15. The Special Senses

The Lens and Focusing Light on the Retina

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Multiple Choice

Which part of the eye helps focus light rays on the retina?

Sclera

Iris

Cornea

Lens

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Verified step by step guidance

Step 1: Begin by understanding the anatomy of the eye. The eye is composed of several structures, each with a specific function. The retina is the light-sensitive layer at the back of the eye where images are formed.

Step 2: Review the function of the sclera. The sclera is the white, outer layer of the eye that provides structural support and protection but does not play a role in focusing light.

Step 3: Examine the role of the iris. The iris is the colored part of the eye that controls the size of the pupil, regulating the amount of light entering the eye, but it does not focus light.

Step 4: Analyze the function of the cornea. The cornea is the transparent front part of the eye that helps refract (bend) light rays, contributing to focusing light, but it is not the primary structure responsible for fine-tuning focus.

Step 5: Understand the role of the lens. The lens is a flexible, transparent structure that adjusts its shape to focus light rays precisely onto the retina, making it the correct answer to the question.