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

21. The Immune System

First-Line Defenses: Normal Microbiota

Anatomy & Physiology

21. The Immune System

First-Line Defenses: Normal Microbiota

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Multiple Choice

Approximately what percent of people have Staphylococcus aureus as part of their normal skin microbiota?

75%

50%

20%

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Verified step by step guidance

Understand the concept of skin microbiota: Skin microbiota refers to the community of microorganisms, including bacteria, fungi, and viruses, that reside on the skin. These microorganisms play a crucial role in protecting against pathogens and maintaining skin health.

Identify the role of Staphylococcus aureus: Staphylococcus aureus is a type of bacteria that can be part of the normal skin microbiota. While it is commonly associated with infections, it can also exist harmlessly on the skin of healthy individuals.

Recognize the prevalence of Staphylococcus aureus: Studies have shown that approximately 20% of people have Staphylococcus aureus as part of their normal skin microbiota. This means that it is relatively common but not present in the majority of the population.

Consider the options given: The problem provides several percentage options (5%, 75%, 50%) and states that the correct answer is 20%. This indicates that the prevalence of Staphylococcus aureus is not as high as 75% or 50%, nor as low as 5%.

Conclude with the correct understanding: Based on the information provided, the correct percentage of people who have Staphylococcus aureus as part of their normal skin microbiota is 20%. This reflects its presence in a significant minority of the population.