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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Approximately how many cells make up the adult human body?

About 500 million

About 100 billion

About 1 million

About 37 trillion

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Verified step by step guidance

Step 1: Understand the context of the question. The problem is asking for an approximate number of cells in the adult human body, which is a fundamental concept in Anatomy & Physiology related to cellular biology.

Step 2: Recall that the human body is composed of trillions of cells, which vary in type and function, including red blood cells, neurons, epithelial cells, and more. These cells work together to maintain homeostasis and perform essential functions.

Step 3: Consider the scale of the human body. The adult human body is made up of a vast number of cells, far exceeding millions or billions. This is due to the complexity and size of the body, as well as the microscopic nature of cells.

Step 4: Compare the options provided. 'About 500 million' and 'About 1 million' are far too small to represent the total number of cells in the human body. 'About 100 billion' is closer but still significantly underestimates the actual number. The correct approximation is 'About 37 trillion,' which aligns with scientific estimates.

Step 5: Conclude that the adult human body contains approximately 37 trillion cells, a number derived from extensive research and calculations based on cell density, body mass, and average cell size.