All ____ depend on organ systems to meet their survival needs.

All ____ depend on organ systems to meet their survival needs.

• A. Cells
• B. Tissues
• C. Organs
• D. Molecules

Answer: (A)

Cells are the basic units that carry out life processes, and their survival hinges on organ systems maintaining a stable internal environment. To meet a cell’s needs, oxygen and nutrients must be delivered to it, and wastes must be removed. The respiratory and circulatory systems bring in and distribute oxygen and nutrients; the digestive system provides nutrients; the urinary and circulatory systems help remove wastes and regulate fluid balance. Temperature, pH, and overall homeostasis are managed by multiple systems, all working together to keep the extracellular environment suitable for cells. Because cells directly depend on this coordinated support to function and survive, they are the level that most clearly depends on organ systems. While tissues and organs also rely on organ systems, the statement centers on the cell as the fundamental unit whose survival relies on these systemic processes. Molecules, on the other hand, don’t depend on organ systems for their existence in the same way; they’re components that participate within the cellular and systemic environment.

Cells are the basic units that carry out life processes, and their survival hinges on organ systems maintaining a stable internal environment. To meet a cell’s needs, oxygen and nutrients must be delivered to it, and wastes must be removed. The respiratory and circulatory systems bring in and distribute oxygen and nutrients; the digestive system provides nutrients; the urinary and circulatory systems help remove wastes and regulate fluid balance. Temperature, pH, and overall homeostasis are managed by multiple systems, all working together to keep the extracellular environment suitable for cells.

Because cells directly depend on this coordinated support to function and survive, they are the level that most clearly depends on organ systems. While tissues and organs also rely on organ systems, the statement centers on the cell as the fundamental unit whose survival relies on these systemic processes. Molecules, on the other hand, don’t depend on organ systems for their existence in the same way; they’re components that participate within the cellular and systemic environment.