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

1 meter per second

100 miles per hour

1 foot per second

150 meters per second

muscle

the brain

wire

nerve

muscle cells

liver cells

stem cells

skin cells

bipolar neurons

multipolar neurons

Purkinje neurons

pyramidal neurons

telegraph

proteins

hormonal

electrical impulses

glial cells

stem cells

muscle cells

prison cells

all of the above

brains

a nerve

spinal cord

1 year

1 month

10 years

100 years