# Cell division during pregnancy

1. Feb 1, 2009

### kasse

A baby is born weighing 4kg. It starts its life from a single cell, which then divides into 2 cells, each
of those two divide then again, and so on. Use information from the problem above above to calculate
how many diffusion process happen in the 9 months of pregnancy. Is this a realistic answer? Which
assumptions are most questionable?

Assuming that 50% of the baby's mass consists of cells, and that each cell has a mass of 6.3E-13 kg, we have a total number of 3.2E12 cells when the baby is born.

Find number of diffusion processes:

$$1 \cdot 2^x = 3.2 \cdot 10^{12} \Rightarrow x = log_2(3.2 \cdot 10^{12}) \approx 42$$

Is my thinking and calculations correct? Is this a realistic answer? Which
assumptions are most questionable?

Last edited: Feb 1, 2009
2. Feb 1, 2009

### mgb_phys

Do all cells divide?
Do any cells die and are removed?

Other than that, looks good