all of the above

spinal cord

brains

a nerve

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

wire

the brain

nerve

muscle

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

multipolar neurons

pyramidal neurons

bipolar neurons

Purkinje neurons

hormonal

proteins

telegraph

electrical impulses

1 month

10 years

100 years

1 year

stem cells

liver cells

skin cells

muscle cells

muscle cells

stem cells

glial cells

prison cells