proteins

telegraph

electrical impulses

hormonal

brains

all of the above

a nerve

spinal cord

bipolar neurons

multipolar neurons

pyramidal neurons

Purkinje neurons

nerve

muscle

wire

the brain

stem cells

muscle cells

liver cells

skin cells

1 year

100 years

1 month

10 years

prison cells

stem cells

glial cells

muscle cells

1 meter per second

1 foot per second

150 meters per second

100 miles per hour

they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

they regenerate very quickly