telegraph

electrical impulses

hormonal

proteins

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

stem cells

muscle cells

glial cells

prison cells

nerve

wire

the brain

muscle

1 month

100 years

10 years

1 year

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

skin cells

liver cells

stem cells

muscle cells

all of the above

a nerve

brains

spinal cord

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons