hormonal

electrical impulses

telegraph

proteins

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

stem cells

skin cells

liver cells

muscle cells

10 years

100 years

1 year

1 month

brains

all of the above

a nerve

spinal cord

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

stem cells

prison cells

muscle cells

glial cells

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

nerve

muscle

the brain

wire