spinal cord

all of the above

a nerve

brains

hormonal

proteins

electrical impulses

telegraph

10 years

1 month

100 years

1 year

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

muscle

nerve

wire

the brain

stem cells

muscle cells

skin cells

liver cells

prison cells

muscle cells

glial cells

stem cells

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

150 meters per second

1 foot per second

1 meter per second

100 miles per hour