100 years

10 years

1 year

1 month

a nerve

all of the above

spinal cord

brains

muscle cells

liver cells

skin cells

stem cells

nerve

muscle

the brain

wire

telegraph

proteins

hormonal

electrical impulses

stem cells

muscle cells

glial cells

prison cells

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons

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

1 meter per second

1 foot per second

100 miles per hour

150 meters per second