telegraph

electrical impulses

hormonal

proteins

prison cells

stem cells

glial cells

muscle cells

nerve

wire

the brain

muscle

brains

all of the above

a nerve

spinal cord

pyramidal neurons

bipolar neurons

multipolar neurons

Purkinje neurons

they do not have a nucleus

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they regenerate very quickly

10 years

100 years

1 month

1 year

150 meters per second

1 foot per second

1 meter per second

100 miles per hour

liver cells

muscle cells

stem cells

skin cells