electrical impulses

telegraph

hormonal

proteins

they do not have a nucleus

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

the brain

nerve

muscle

wire

100 years

1 month

10 years

1 year

spinal cord

a nerve

brains

all of the above

liver cells

stem cells

muscle cells

skin cells

multipolar neurons

bipolar neurons

pyramidal neurons

Purkinje neurons

100 miles per hour

1 foot per second

1 meter per second

150 meters per second

stem cells

glial cells

prison cells

muscle cells