How many main body systems does the human body consist of?

The human body consists of eleven main body systems, which is why the correct answer is the choice indicating this number. These systems each play a critical role in maintaining the overall function and health of the body. The eleven systems are:

1. Integumentary System

2. Skeletal System

3. Muscular System

4. Nervous System

5. Endocrine System

6. Cardiovascular System

7. Lymphatic System

8. Respiratory System

9. Digestive System

10. Urinary System

11. Reproductive System

Each system works in concert with the others to support various physiological functions, from movement and protection to hormone regulation and nutrient absorption. Understanding the number of systems and their functions is fundamental in fields like anatomy and physiology, as well as in related health professions. This knowledge is essential for students or professionals studying how these systems interact and contribute to the human body's homeostasis and overall well-being.