100 years

1 month

10 years

1 year

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

a nerve

brains

all of the above

spinal cord

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

Purkinje neurons

bipolar neurons

pyramidal neurons

multipolar neurons

liver cells

stem cells

skin cells

muscle cells

electrical impulses

hormonal

proteins

telegraph

stem cells

muscle cells

prison cells

glial cells

muscle

the brain

wire

nerve