This is confirmed to be True.
Organs or organ systems are directly below the hierarchical organization of life. For an organism to act or function properly organ systems are needed to exist. The following are examples of organ systems that are needed by an organism:
1. Nervous System
2. Digestive System
3. Reproductive System
4. Respiratory System
5. Muscular System
6. Skeletal System
7. Endocrine System
8. Immune System
9. Excretory System
10. Circulatory System
11. Integumentary System
You get tired when you run because our leg muscles don't get enough oxygen anymore.
Extreme desire to be abnormally thin. People with these conditions have dangerous eating habits and often resort to excessive activity to expend calories. Eating disorders that are abuse exercise are considered hyperkinetic conditions.
