wire

nerve

muscle

the brain

stem cells

skin cells

muscle cells

liver cells

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

telegraph

hormonal

electrical impulses

proteins

muscle cells

glial cells

prison cells

stem cells

all of the above

a nerve

spinal cord

brains

1 meter per second

1 foot per second

150 meters per second

100 miles per hour

1 year

10 years

1 month

100 years

multipolar neurons

Purkinje neurons

pyramidal neurons

bipolar neurons