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

2. Cell Chemistry & Cell Components

Microscopes

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Microscopes

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Multiple Choice

What is the purpose of the immersion oil used with the 100x objective on a microscope?

To protect the lens from scratches

To provide a cooling effect to the lens

To magnify the specimen further

To increase the numerical aperture and improve resolution

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Verified step by step guidance

Understand the concept of numerical aperture (NA): Numerical aperture is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. It is crucial for determining the resolving power of a microscope.

Recognize the role of immersion oil: Immersion oil is used to bridge the gap between the microscope slide and the objective lens. It has a refractive index similar to glass, which helps in minimizing light refraction.

Identify the effect of immersion oil on light: By using immersion oil, more light is directed into the objective lens, which increases the numerical aperture. This is because the oil reduces the refraction of light as it passes from the glass slide to the lens.

Connect numerical aperture to resolution: A higher numerical aperture allows the microscope to resolve finer details, improving the resolution of the image. This means that the microscope can distinguish between two points that are close together more effectively.

Conclude the purpose of immersion oil: The primary purpose of using immersion oil with the 100x objective is to increase the numerical aperture, thereby enhancing the resolution and clarity of the image observed under the microscope.