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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2:32 minutes

Problem 6

Textbook Question

Accessory glands that produce an oily secretion are the
a. Conjunctiva
b. Lacrimal glands
c. Tarsal glands

Verified step by step guidance

Step 1: Understand the question. The problem is asking about accessory glands that produce an oily secretion. This requires knowledge of the anatomy and physiology of glands associated with the eye.

Step 2: Review the function of each option provided: a) Conjunctiva is a mucous membrane that lines the eyelids and covers the sclera, but it does not produce oily secretions. b) Lacrimal glands produce tears, which are primarily watery and help lubricate the eye, not oily. c) Tarsal glands (also known as Meibomian glands) are specialized sebaceous glands located along the edges of the eyelids and are responsible for producing an oily secretion that prevents evaporation of the eye's tear film.

Step 3: Eliminate incorrect options based on their functions. Since conjunctiva and lacrimal glands do not produce oily secretions, they can be ruled out.

Step 4: Focus on the correct option. Tarsal glands are the accessory glands that produce the oily secretion, which is essential for maintaining the stability of the tear film and preventing dry eyes.

Step 5: Conclude that the correct answer is c) Tarsal glands, based on their anatomical location and physiological role in producing oily secretions.

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Key Concepts

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

Accessory Glands

Accessory glands are specialized structures that produce secretions to support various physiological functions. In the context of the eye, these glands contribute to the maintenance of the tear film and overall ocular health. Understanding their role is crucial for identifying which glands produce specific types of secretions.

Tarsal Glands

Tarsal glands, also known as Meibomian glands, are located within the eyelids and secrete an oily substance called meibum. This secretion helps to prevent the evaporation of the tear film, ensuring that the eyes remain lubricated. Recognizing the function of tarsal glands is essential for answering questions related to eye anatomy and physiology.

Lacrimal Glands

Lacrimal glands are responsible for producing tears, which are primarily composed of water, electrolytes, and proteins. These glands play a vital role in maintaining eye moisture and providing nutrients to the cornea. Differentiating between the functions of lacrimal glands and other accessory glands is important for understanding the complete ocular system.

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Related Practice

Multiple Choice

How are rods different from cones in the human 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

The portion of the fibrous layer that is white and opaque is the

a. Choroid

b. Cornea

c. Retina

d. Sclera

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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.