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

telegraph

electrical impulses

hormonal

proteins

muscle

wire

nerve

the brain

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons

1 year

100 years

10 years

1 month

a nerve

spinal cord

all of the above

brains

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

prison cells

glial cells

stem cells

muscle cells

stem cells

muscle cells

liver cells

skin cells