1. Increased Volume: The most obvious change is an increase in the cell's overall size, or volume. This happens as the cell takes in nutrients and synthesizes more organic molecules.

2. Organelle Growth: The cell's internal organelles, like mitochondria, the endoplasmic reticulum, and Golgi apparatus, also increase in size and number to support the cell's larger volume.

3. Surface Area-to-Volume Ratio Changes: As the cell grows, its volume increases much faster than its surface area. This change in the surface area-to-volume ratio becomes a limiting factor for cell growth.

4. Limitations to Growth:

* Nutrient Diffusion: As the cell gets larger, it becomes harder for nutrients to diffuse quickly enough to all parts of the cell.

* Waste Removal: Similarly, waste products can't be efficiently removed from the cell's interior if the surface area is too small relative to the volume.

* DNA Replication & Distribution: The cell's DNA (genetic material) needs to be copied and distributed equally to the daughter cells during division. A larger cell makes this process more complex.

5. Cell Division: To overcome the limitations of growth, animal cells eventually reach a point where they divide into two smaller daughter cells. This process is called mitosis. Division ensures that each new cell has a manageable surface area-to-volume ratio and can continue to function efficiently.

In summary, animal cell growth is a complex process involving an increase in volume, organelle growth, and eventual division to maintain optimal function.