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

prison cells

muscle cells

glial cells

stem cells

1 month

1 year

100 years

10 years

liver cells

muscle cells

skin cells

stem cells

wire

the brain

muscle

nerve

Purkinje neurons

pyramidal neurons

multipolar neurons

bipolar neurons

telegraph

electrical impulses

proteins

hormonal

all of the above

brains

a nerve

spinal cord

1 foot per second

100 miles per hour

1 meter per second

150 meters per second