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

Rods, Cones, and Light

Anatomy & Physiology

15. The Special Senses

Rods, Cones, and Light

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2:29 minutes

Problem 7

Textbook Question

The portion of the fibrous layer that is white and opaque is the
a. Choroid
b. Cornea
c. Retina
d. Sclera

Verified step by step guidance

Understand the anatomy of the eye: The eye is composed of three main layers - the fibrous layer, the vascular layer, and the inner layer. The fibrous layer is the outermost layer and includes two main structures: the sclera and the cornea.

Identify the characteristics of the sclera: The sclera is the white, opaque portion of the fibrous layer. It provides structural support and protection for the eye and serves as an attachment point for the extrinsic eye muscles.

Differentiate the cornea: The cornea is the transparent, anterior portion of the fibrous layer. It allows light to enter the eye and plays a role in focusing vision.

Eliminate the other options: The choroid is part of the vascular layer, not the fibrous layer, and is responsible for providing blood supply to the eye. The retina is part of the inner layer and contains photoreceptor cells for vision.

Conclude that the correct answer is the sclera, as it is the white and opaque portion of the fibrous layer.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Fibrous Layer of the Eye

The fibrous layer of the eye consists of two main parts: the sclera and the cornea. This layer provides structural support and protection to the inner components of the eye. The sclera is the white, opaque part that maintains the shape of the eyeball, while the cornea is the transparent front part that allows light to enter.

Sclera

The sclera is the tough, white outer layer of the eyeball, often referred to as the 'white of the eye.' It is composed of dense connective tissue and provides protection and stability to the eye. The sclera also serves as an attachment point for the eye muscles, facilitating movement.

Cornea

The cornea is the clear, dome-shaped surface that covers the front of the eye. It plays a crucial role in focusing light onto the retina and is responsible for a significant portion of the eye's total optical power. Unlike the sclera, the cornea is transparent, allowing light to pass through while also protecting the inner structures of the eye.

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Multiple Choice

Which of these is not a type of photoreceptor?

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Multiple Choice

Which process allows more light to reach the periphery of the retina?

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Multiple Choice

To which colors are the three different kinds of cones in the human eye sensitive?

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Textbook Question

Accessory glands that produce an oily secretion are the

a. Conjunctiva

b. Lacrimal glands

c. Tarsal glands

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Textbook Question

Of the neurons in the retina, the axons of which of these form the optic nerve?

a. Bipolar cells

b. Ganglion cells

c. Cone cells

d. Horizontal cells

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Multiple Choice

A light hits your retina with a wavelength of 610 nm. Which cones will be stimulated, and what color will you perceive? Use the figure to help you answer.

Imagine that you are walking in the woods at night in very low light. A red flower and a green leaf are both reflecting the same total amount of light. Which would appear brighter to you and why? The image is provided for reference.

Which sequence follows the correct passage of light entering the cornea?

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