proteins

electrical impulses

hormonal

telegraph

the brain

nerve

muscle

wire

muscle cells

skin cells

liver cells

stem cells

1 foot per second

150 meters per second

1 meter per second

100 miles per hour

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

they regenerate very quickly

1 year

100 years

1 month

10 years

spinal cord

brains

a nerve

all of the above

stem cells

glial cells

muscle cells

prison cells

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons