spinal cord

all of the above

brains

a nerve

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

hormonal

telegraph

proteins

electrical impulses

skin cells

stem cells

muscle cells

liver cells

muscle

the brain

nerve

wire

1 year

1 month

10 years

100 years

150 meters per second

100 miles per hour

1 foot per second

1 meter per second

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons

muscle cells

stem cells

prison cells

glial cells