Okay, everyone. Normal microbiota has what characteristics? Okay. So what is your normal microbiota? Also commonly called the human microbiota or microbiome. This is going to be the huge amount of microorganisms that actually live on or in your body, which is kind of crazy to think about, but they're microscopic, so we never really see them. But we do experience the effects that they give. They help with our digestion, and they also help us with a whole bunch of different things, including keeping us safe from pathogenic microbes. So these microbes in our normal human microbiome are safe, and they take care of us, and they're not pathogenic. But pathogenic microorganisms can come in and try to attack our bodies, and they actually protect us. So let's have a look at our answers. Answer choice a says, the normal microbiota are the organisms that typically reside on or in our body. Yes. Entirely true. They protect us against infection by pathogens. That's also true. So the way that they do this is they are on and in our body, so they have access to all of the nutrients that they need. They're not going to like other micro microorganisms coming in, so they're gonna compete with those other microorganisms for resources. They're gonna compete with them for actual locations to live on, So they're beating these pathogenic microbes off because they wanna live here, they don't want someone else to live here. And they actually a lot of them produce chemicals that pathogenic microbes don't like or that are bad for pathogenic microbes. So they help us in a lot of different ways. What about c? They enhance infection by pathogens. They most certainly do not. And they play no role in affecting pathogen growth. Absolutely not. They help us out a lot. So a and b are correct. So that means answer choice e is the correct answer. The normal microbiota or human microbiome are the microscopic organisms that typically reside in or on our bodies and protect us from other pathogenic microbes. Okay, everyone. Let's move on to our next video.

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

Normal microbiota:

Are the organisms that typically reside on and in your body.

Protect against infection by pathogens.

Enhance infection by pathogens.

Play no role in affecting pathogen growth.

A and B.

C and D.

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Verified step by step guidance

Understand the concept of normal microbiota: These are the microorganisms that naturally live on and inside the human body, such as bacteria, fungi, and viruses, without causing disease under normal circumstances.

Consider the role of normal microbiota in protecting against infection: They compete with pathogens for nutrients and space, produce substances harmful to pathogens, and stimulate the immune system.

Evaluate the statement 'Enhance infection by pathogens': Normal microbiota typically do not enhance infections; instead, they help prevent them by maintaining a balanced microbial environment.

Assess the statement 'Play no role in affecting pathogen growth': This is incorrect because normal microbiota do play a significant role in inhibiting pathogen growth through various mechanisms.

Conclude that the correct answers are A and B, as normal microbiota reside on and in the body and protect against infection by pathogens, while C and D are incorrect.