telegraph

proteins

hormonal

electrical impulses

muscle

the brain

nerve

wire

spinal cord

a nerve

brains

all of the above

prison cells

muscle cells

glial cells

stem cells

they are very long compared to other cells in the body

they regenerate very quickly

they help carry oxygen to different parts of your body

they do not have a nucleus

stem cells

skin cells

muscle cells

liver cells

pyramidal neurons

bipolar neurons

multipolar neurons

Purkinje neurons

1 month

100 years

10 years

1 year

150 meters per second

1 meter per second

100 miles per hour

1 foot per second