they do not have a nucleus

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

10 years

100 years

1 year

1 month

proteins

electrical impulses

hormonal

telegraph

muscle

the brain

nerve

wire

stem cells

muscle cells

prison cells

glial cells

a nerve

all of the above

brains

spinal cord

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

pyramidal neurons

multipolar neurons

bipolar neurons

Purkinje neurons

liver cells

muscle cells

skin cells

stem cells