10 years

1 year

100 years

1 month

stem cells

skin cells

muscle cells

liver cells

they regenerate very quickly

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

telegraph

electrical impulses

hormonal

proteins

muscle cells

stem cells

glial cells

prison cells

nerve

wire

muscle

the brain

multipolar neurons

bipolar neurons

Purkinje neurons

pyramidal neurons

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

brains

all of the above

spinal cord

a nerve