they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

electrical impulses

hormonal

telegraph

proteins

150 meters per second

1 meter per second

1 foot per second

100 miles per hour

1 month

1 year

10 years

100 years

Purkinje neurons

pyramidal neurons

multipolar neurons

bipolar neurons

muscle cells

liver cells

stem cells

skin cells

glial cells

prison cells

stem cells

muscle cells

the brain

nerve

wire

muscle

a nerve

spinal cord

brains

all of the above