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

Why is there a blind spot in each eye?

Because the optic nerve exits the eye at the optic disc, where there are no photoreceptors.

Because the lens of the eye is not perfectly transparent.

Because the retina is thicker in certain areas, preventing light from reaching photoreceptors.

Because the cornea blocks some light from entering the eye.

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Verified step by step guidance

Understand the structure of the eye: The eye is composed of several parts including the cornea, lens, retina, and optic nerve. The retina contains photoreceptors that detect light.

Identify the role of the optic nerve: The optic nerve is responsible for transmitting visual information from the retina to the brain. It exits the eye at a specific location known as the optic disc.

Recognize the significance of the optic disc: The optic disc is the point where the optic nerve exits the eye. This area lacks photoreceptors, which are necessary for detecting light.

Explain the concept of a blind spot: Since the optic disc has no photoreceptors, any light that falls on this area cannot be detected, creating a blind spot in the visual field.

Clarify why other options are incorrect: The lens transparency, retina thickness, and cornea blocking light do not contribute to the blind spot. The blind spot is solely due to the absence of photoreceptors at the optic disc.