muscle cells

skin cells

liver cells

stem cells

electrical impulses

proteins

hormonal

telegraph

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

1 year

100 years

1 month

10 years

wire

nerve

the brain

muscle

100 miles per hour

150 meters per second

1 foot per second

1 meter per second

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

muscle cells

stem cells

glial cells

prison cells

brains

a nerve

spinal cord

all of the above