A CHICKEN’s egg is large
enough to hold in your
hand while most cells take a microscope to
see them. A chicken’s egg is big because much of
it is stored food for growth of an embryo.
Cells are incredibly variable. Bacterial cell
looks simple compared to those within our
nervous system. However, the bacterial cell is
the entire organism; that senses the
environment, obtains food, gets rid of waste,
and reproduces. In contrast, a human being is
composed of approximately 10 trillion cells.
Each type of human cell is specialized to
perform specific functions, but it still has to do
many of the same things a bacterial cell is
required to do.