proteins

telegraph

electrical impulses

hormonal

muscle cells

stem cells

glial cells

prison cells

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

muscle cells

stem cells

skin cells

liver cells

bipolar neurons

multipolar neurons

pyramidal neurons

Purkinje neurons

1 year

1 month

10 years

100 years

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

spinal cord

brains

all of the above

a nerve

the brain

wire

nerve

muscle