hormonal

telegraph

proteins

electrical impulses

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

nerve

the brain

muscle

wire

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons

stem cells

muscle cells

skin cells

liver cells

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

prison cells

stem cells

muscle cells

glial cells

100 years

1 year

10 years

1 month

a nerve

brains

all of the above

spinal cord