1 year

100 years

1 month

10 years

all of the above

spinal cord

a nerve

brains

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

electrical impulses

proteins

hormonal

telegraph

wire

the brain

nerve

muscle

skin cells

stem cells

muscle cells

liver cells

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

prison cells

stem cells

muscle cells

glial cells

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons