proteins

electrical impulses

telegraph

hormonal

the brain

muscle

nerve

wire

1 year

1 month

10 years

100 years

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

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons

muscle cells

prison cells

glial cells

stem cells

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

stem cells

liver cells

skin cells

muscle cells

a nerve

spinal cord

all of the above

brains