100 years

1 year

1 month

10 years

100 miles per hour

1 meter per second

1 foot per second

150 meters per second

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

they do not have a nucleus

stem cells

skin cells

liver cells

muscle cells

electrical impulses

telegraph

hormonal

proteins

muscle

nerve

the brain

wire

spinal cord

all of the above

brains

a nerve

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

glial cells

muscle cells

prison cells

stem cells