wire

muscle

nerve

the brain

skin cells

liver cells

muscle cells

stem cells

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

electrical impulses

hormonal

proteins

telegraph

1 month

100 years

1 year

10 years

Purkinje neurons

pyramidal neurons

bipolar neurons

multipolar neurons

spinal cord

brains

all of the above

a nerve

1 foot per second

100 miles per hour

1 meter per second

150 meters per second

stem cells

prison cells

muscle cells

glial cells