1 year

1 month

10 years

100 years

electrical impulses

hormonal

telegraph

proteins

stem cells

liver cells

muscle cells

skin cells

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

spinal cord

a nerve

all of the above

brains

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

stem cells

muscle cells

prison cells

glial cells

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

nerve

muscle

the brain

wire