hormonal

electrical impulses

telegraph

proteins

wire

the brain

nerve

muscle

1 year

100 years

10 years

1 month

100 miles per hour

1 foot per second

1 meter per second

150 meters per second

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

muscle cells

glial cells

stem cells

prison cells

a nerve

spinal cord

brains

all of the above

stem cells

skin cells

liver cells

muscle cells