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 Heart2h 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

The human body typically begins to be colonized by its normal microflora:

Before birth, in utero.

When a child first goes to school.

During puberty.

During and immediately after birth.

When an infant gets its first infectious disease.

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Verified step by step guidance

Understand the concept of 'normal microflora': These are the microorganisms that reside in and on our bodies, playing a crucial role in health by preventing the colonization of harmful pathogens and aiding in digestion.

Recognize the timing of colonization: The human body begins to be colonized by normal microflora during and immediately after birth. This is because the infant is exposed to the mother's microbiota during delivery and the environment thereafter.

Consider the role of the birth process: During vaginal delivery, the infant is exposed to the mother's vaginal and intestinal flora, which initiates the colonization process.

Acknowledge post-birth factors: After birth, factors such as breastfeeding and contact with caregivers further contribute to the establishment of the infant's microflora.

Differentiate from other life stages: While microflora can change during other life stages like puberty or when attending school, the initial colonization begins at birth.