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

23. The Digestive System

Introduction to the Digestive System

Anatomy & Physiology

23. The Digestive System

Introduction to the Digestive System

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Multiple Choice

The human gut is home to about how many microorganisms?

100 billion

100 million

100 trillion

10 million

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Verified step by step guidance

Understand the context: The human gut microbiome is a complex community of microorganisms that play a crucial role in digestion, immunity, and overall health.

Recognize the scale: The number of microorganisms in the human gut is often expressed in terms of large numbers, typically in the billions or trillions.

Identify the correct magnitude: Among the options provided, 100 trillion is the most accurate estimate of the number of microorganisms in the human gut.

Consider the scientific consensus: Current research supports the estimate that the human gut contains approximately 100 trillion microorganisms, which includes bacteria, viruses, fungi, and other microbes.

Reflect on the significance: The vast number of microorganisms highlights the importance of the gut microbiome in maintaining health and its potential impact on various physiological processes.