they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

muscle

the brain

nerve

wire

100 miles per hour

150 meters per second

1 foot per second

1 meter per second

telegraph

hormonal

proteins

electrical impulses

1 month

1 year

100 years

10 years

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons

liver cells

skin cells

muscle cells

stem cells

a nerve

all of the above

brains

spinal cord

stem cells

glial cells

prison cells

muscle cells