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

Which layer of the eye is known as the outermost protective layer?

Choroid

Iris

Retina

Sclera

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Verified step by step guidance

Step 1: Begin by understanding the anatomy of the eye, which consists of three main layers: the outer layer, the middle layer, and the inner layer.

Step 2: Learn the function of each layer. The outer layer is primarily protective and includes the sclera and cornea. The middle layer contains the choroid, ciliary body, and iris, which are involved in nourishment and controlling light entry. The inner layer is the retina, responsible for processing visual information.

Step 3: Focus on the outer layer. The sclera is the tough, white, fibrous tissue that forms the majority of the outer layer, providing structural support and protection for the eye.

Step 4: Compare the sclera to the other options provided in the question. The choroid is part of the middle layer and provides blood supply; the iris controls the size of the pupil; the retina is the inner layer responsible for vision.

Step 5: Conclude that the sclera is the correct answer because it is the outermost protective layer of the eye, shielding the internal structures from damage.