1. Skeletal System: Provides support, protection, and structure.

2. Muscular System: Allows movement, maintains posture, and generates heat.

3. Nervous System: Controls and coordinates bodily functions, including thoughts, emotions, and movements.

4. Circulatory System: Transports blood, oxygen, and nutrients throughout the body.

5. Respiratory System: Enables breathing and gas exchange (oxygen in, carbon dioxide out).

6. Digestive System: Breaks down food, absorbs nutrients, and eliminates waste.

7. Endocrine System: Produces and regulates hormones that control various bodily functions.

8. Lymphatic System: Filters waste, maintains fluid balance, and helps fight infections.

9. Urinary System: Filters waste products from the blood and produces urine.

10. Integumentary System: Includes skin, hair, and nails and protects the body from injury and infection.