telegraph

electrical impulses

proteins

hormonal

prison cells

glial cells

muscle cells

stem cells

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

spinal cord

a nerve

brains

all of the above

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

multipolar neurons

Purkinje neurons

bipolar neurons

pyramidal neurons

nerve

wire

muscle

the brain

skin cells

muscle cells

liver cells

stem cells

1 year

10 years

1 month

100 years