* Undifferentiated cells (stem cells) are the building blocks of growth. They have the ability to divide and differentiate into specialized cells, forming tissues and organs.
* Growth is a complex process that involves not just cell division but also:
* Cell differentiation: Stem cells specialize into various types of cells, each with a specific function.
* Cell migration: Cells move to their appropriate positions within tissues and organs.
* Apoptosis (programmed cell death): This process eliminates unnecessary or damaged cells, maintaining tissue integrity.
* Extracellular matrix formation: This provides structural support and guides cell growth.
Therefore, while undifferentiated cells are crucial for producing new cells, growth is a multifaceted process involving various cellular activities.