they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

they regenerate very quickly

1 year

10 years

100 years

1 month

the brain

nerve

muscle

wire

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

bipolar neurons

multipolar neurons

Purkinje neurons

pyramidal neurons

glial cells

stem cells

prison cells

muscle cells

all of the above

spinal cord

a nerve

brains

muscle cells

liver cells

skin cells

stem cells

proteins

telegraph

hormonal

electrical impulses