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 part of the eye changes shape to adjust the size of the pupil?

Iris

Retina

Cornea

Lens

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Verified step by step guidance

Begin by understanding the basic anatomy of the eye. The eye is composed of several parts, each with a specific function. The main parts include the cornea, lens, iris, and retina.

Identify the function of the iris. The iris is the colored part of the eye surrounding the pupil. Its primary role is to control the diameter and size of the pupil, thus regulating the amount of light that enters the eye.

Consider the role of the pupil. The pupil is the opening in the center of the iris that allows light to enter the retina. The size of the pupil changes in response to light intensity, a process controlled by the iris.

Differentiate the functions of the other parts mentioned: the retina is responsible for receiving light and converting it into neural signals; the cornea helps focus light onto the retina; the lens further focuses light onto the retina but does not change the size of the pupil.

Conclude that the iris is the part of the eye that changes shape to adjust the size of the pupil, allowing more or less light to enter the eye depending on the lighting conditions.