Cells communicate with each other through chemical signals, which allow them to coordinate their activities and respond to changes in their environment.
Cells come in many shapes and sizes: Cells can be spherical, elongated, flattened, or irregular in shape, and they range in size from just a few micrometers to several centimeters.
Many cells in the body have specialized functions, such as muscle cells, nerve cells, and blood cells, which are adapted to carry out specific tasks.
Many cells in the body are constantly being replaced through a process called cell turnover, in which old cells die and are replaced by new ones.
In fact, it's estimated that about 50 billion cells die and are replaced in your body every day.
Your body's cells are able to repair themselves when they become damaged, although this process can become less effective as you age.
Cells are sensitive to their environment
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