telegraph

electrical impulses

hormonal

proteins

spinal cord

a nerve

all of the above

brains

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons

muscle cells

stem cells

glial cells

prison cells

1 meter per second

150 meters per second

1 foot per second

100 miles per hour

muscle

wire

the brain

nerve

skin cells

muscle cells

liver cells

stem cells

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

10 years

1 year

1 month

100 years