brains

spinal cord

all of the above

a nerve

liver cells

skin cells

muscle cells

stem cells

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

10 years

1 year

1 month

100 years

wire

the brain

muscle

nerve

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons

hormonal

proteins

telegraph

electrical impulses

1 meter per second

150 meters per second

1 foot per second

100 miles per hour

prison cells

stem cells

muscle cells

glial cells